Skip to main content

Minerals Or Geodes

Price
Shipping Options
Sort By
Amethyst Geode with Several Mineral Crystal Formations Inside
Located in London, GB
Resembling an infinity sign, this whole geode is a stunning and rich piece, full of mineralogical information. The outer layer is basalt, the interior amethyst crystals, and at the h...
Category

Antique 15th Century and Earlier Uruguayan Natural Specimens

Materials

Amethyst, Quartz, Agate

Large Custom Mounted Agate Stone Mineral Geode Slice Specimen
Located in New York, NY
Very large agate slice on a custom mount featuring shades of banded taupe, brown, black, grey and crystalline white. Agate is thought to bring about an emotional, physical and intell...
Category

21st Century and Contemporary Brazilian Organic Modern Natural Specimens

Materials

Agate, Metal

Natural Agate Geode Druze Amethyst Minerals Crystal Healers Meditation Sphere
Located in Milano, IT
This Crystal Sphere is composed of light purple Agate geode and druze Amethyst minerals which are one of the most powerful crystal healers; focused in growth and stability. A crystal...
Category

Vintage 1980s Uruguayan Arts and Crafts Natural Specimens

Materials

Agate, Amethyst

Unmatching Pair of Quartz & Amethyst Geode Mineral Stone Bookends / Paperweights
Located in Barcelona, ES
Large amethyst and quartz geode mineral decorative bookends or paperweights, Spain, 1950s. The amethyst Quartz crystal stone has a soft purple color and the shine of the minerals cry...
Category

Mid-20th Century Spanish Paperweights

Materials

Stone, Amethyst, Quartz

Lemon Quartz Crystal Cluster Mineral with Coordinating Baroque Pearls and Geode
By Interi
Located in Dublin, Dalkey
Lemon quartz crystal cluster with coordinating natural forming Baroque pearls and geode on a Lucite stand. Lemon Quartz is known for its color that has naturally formed in its matrix...
Category

21st Century and Contemporary Brazilian Natural Specimens

Materials

Rock Crystal

Pair of French Bronze & Rock Crystal Mineral Geode Table Lamps, Marc Du Plantier
By Marc du Plantier
Located in New York, NY
Elegant, rare and timeless pair of mineral crystal geode table by the renowned French mid-20th century interior designer and architect, Marc Duplantier. The raw rock crystal is delic...
Category

Mid-20th Century French Mid-Century Modern Table Lamps

Materials

Rock Crystal, Wrought Iron

Onyx Agate Geode Jewelry Dish or Decorative Object
Located in New York, NY
A beautiful and substantial neutral onyx agate geode dish, decorative object, or small bowl/vessel. Piece can work as a small jewelry/trinket dish, a standalone decorative piece, or ...
Category

20th Century Organic Modern Decorative Dishes and Vide-Poche

Materials

Agate, Onyx

Amethyst Geode
Located in East Hampton, NY
Large beautiful amethyst geode.
Category

Mid-20th Century Natural Specimens

  • Amethyst Geode
  • Amethyst Geode
  • Amethyst Geode
  • Amethyst Geode
H 14.5 in. W 8.5 in. D 5 in.
1950s Agate Geode Stone Bowl, Paperweight or Book Holder
Located in Barcelona, ES
Lovely natural geode stone bowl, bookend or paperweight, Spain, 1950s. This agate geode rock has a polished face showing the mineral’s distinctive banding striations in different sh...
Category

Mid-20th Century Spanish Mid-Century Modern Ashtrays

Materials

Agate, Stone

Amethyst Geode
Located in London, by appointment only
A striking sample of the popular amethyst geode. This piece has striking agate bands around the edge of the structure and well defined crystals in the centre. Measures: H 20, W ...
Category

Early 20th Century Brazilian Modern More Desk Accessories

Materials

Stone

  • Amethyst Geode
  • Amethyst Geode
  • Amethyst Geode
  • Amethyst Geode
H 7.88 in. W 17.72 in. D 9.85 in.
1950s Amethyst Geode Stone Hand Carved Bowl or Ashtray
Located in Barcelona, ES
Beautiful amethyst geode hand carved ashtray or rings bowl, Spain, 1950s. This piece of amethyst geode has been carved and polished at the central part allowing to be used as jewelr...
Category

Mid-20th Century Spanish Mid-Century Modern Decorative Bowls

Materials

Stone, Amethyst

Amethyst Geode
Located in London, by appointment only
Brazil. Measure: H21cm. W 28cm. D17cm.
Category

20th Century Brazilian Modern More Desk Accessories

Materials

Stone

  • Amethyst Geode
  • Amethyst Geode
  • Amethyst Geode
  • Amethyst Geode
H 8.27 in. W 11.03 in. D 6.7 in.
Polished Geode Specimen Ash Tray or Desk Top Dish
Located in Ferndale, MI
Beautiful natural form polished Geode possibly rock crystal specimen bowl.
Category

Mid-20th Century American American Craftsman Natural Specimens

Materials

Agate

Mineral Spherical Vessel
By Ernest Miller
Located in Minneapolis, MN
Ernest Miller is a ceramicist who harkens from the Midwest and resides in MN. Inspiration for his work comes from field landscapes and architectural features such as barns found in t...
Category

21st Century and Contemporary American Modern Vases

Materials

Porcelain

  • Mineral Spherical Vessel
  • Mineral Spherical Vessel
  • Mineral Spherical Vessel
  • Mineral Spherical Vessel
H 16 in. Dm 5 in.
Wood and Onyx Agate Geode Round Jewelry or Trinket Box
Located in New York, NY
A beautiful wood and purple agate geode round jewelry or trinket box, circa late 20th century. Box measures: 4.38" diameter
Category

Late 20th Century Modern Decorative Boxes

Materials

Agate, Onyx

Mineral Decorative Plate
By Ernest Miller
Located in Minneapolis, MN
This new item is a glazed heavyweight large porcelain plate that is glazed with a pale 'mineral' grey green cast. Signed by the artist. Created by the artist for West Shore Collectio...
Category

21st Century and Contemporary American Organic Modern Decorative Dishes ...

Materials

Ceramic

  • Mineral Decorative Plate
  • Mineral Decorative Plate
  • Mineral Decorative Plate
  • Mineral Decorative Plate
H 2.25 in. Dm 19.75 in.
Mineral Conical Vessel
By Ernest Miller
Located in Minneapolis, MN
Professional, skilled furniture restoration is an integral part of what we do every day. Our goal is to provide beautiful, functional furniture that honors its illustrious past. Our ...
Category

21st Century and Contemporary American Vases

Materials

Ceramic

  • Mineral Conical Vessel
  • Mineral Conical Vessel
  • Mineral Conical Vessel
  • Mineral Conical Vessel
H 14 in. Dm 4.5 in.
Large Amethyst Geode
Located in Pasadena, CA
This is a superb example of a "twinned" amethyst geode. The crystals are an intense purple with well-formed large points. The geode is in excellent condition. A custom black lacquere...
Category

Mid-20th Century Brazilian Mid-Century Modern Natural Specimens

Materials

Amethyst

  • Large Amethyst Geode
  • Large Amethyst Geode
  • Large Amethyst Geode
  • Large Amethyst Geode
H 25 in. W 15 in. D 8 in.
Mica Mineral Specimen
Located in New York, NY
A large vintage mica specimen featuring mica blades clustered together in various positions and angles. Considering the general flakiness of mica, this piece is in great condition.
Category

20th Century Mid-Century Modern Natural Specimens

  • Mica Mineral Specimen
  • Mica Mineral Specimen
  • Mica Mineral Specimen
  • Mica Mineral Specimen
H 4 in. W 7 in. D 5 in.
Wood and Onyx Agate Geode Round Jewelry or Trinket Box
Located in New York, NY
A beautiful wood and onyx agate geode round jewelry or trinket box, circa late-20th century. Box measures: 4.38" diameter
Category

Late 20th Century Decorative Boxes

Materials

Agate, Onyx

Mounted Amethyst Geode
Located in London, by appointment only
Brazil. A substantial specimen of Brazilian amethyst mounted on a wrought iron base including stand. Measures: H 49.5cm. W 38cm. D 24 cm.
Category

20th Century Brazilian Modern More Desk Accessories

Materials

Stone

  • Mounted Amethyst Geode
  • Mounted Amethyst Geode
  • Mounted Amethyst Geode
  • Mounted Amethyst Geode
H 19.49 in. W 14.97 in. D 9.45 in.
Classical Victorian Cast Iron Urn Planter Probably Fisk or Mott with Handles
By Fiske Or Mott
Located in New York, NY
Victorian cast iron urn planter with dramatic handles. The urn has beautiful original patinated finish. Diameter with handles 32 x 12 interior D x 20 D w/o handles x 26 H to top of b...
Category

Antique Late 19th Century American Victorian Urns

Materials

Iron

Murano Alessandro Mandruzzato Faceted Geode Red Glass Bowl or Caviar Bowl
By Alessandro Mandruzzato
Located in North Miami, FL
This gorgeous large Italian Murano vintage Alessandro Mandruzzato diamond faceted flat cut polished Sommerso geode bowl is great for serving caviar, for serving or just as a great Mu...
Category

Vintage 1970s Italian Modern Glass

Materials

Blown Glass

Taula White Marble Small Side Table
By Casa Mineral
Located in Mexico City, MX
Side table in carved Veneciano white marble. Available on request in Monterrey black marble.
Category

2010s Mexican Modern Side Tables

Materials

Marble

  • Taula White Marble Small Side Table
  • Taula White Marble Small Side Table
  • Taula White Marble Small Side Table
  • Taula White Marble Small Side Table
H 15.75 in. W 21.66 in. D 11.82 in.
Dolmen White Marble Medium Side Table
By Casa Mineral
Located in Mexico City, MX
Side table in carved Veneciano white marble. Available on request in Monterrey black marble.
Category

2010s Mexican Modern Side Tables

Materials

Marble

Dolmen White Marble Large Side Table
By Casa Mineral
Located in Mexico City, MX
Side table in carved Veneciano white marble. Available on request in Monterrey black marble.
Category

2010s Mexican Modern Side Tables

Materials

Marble

  • Dolmen White Marble Large Side Table
  • Dolmen White Marble Large Side Table
  • Dolmen White Marble Large Side Table
  • Dolmen White Marble Large Side Table
H 23.63 in. Dm 17.72 in.
Tholos Black Marble Medium Side Table
By Casa Mineral
Located in Mexico City, MX
Side table in carved Monterrey black marble.
Category

2010s Mexican Modern Side Tables

Materials

Marble

Talayot Black Marble Carved Large Bowl
By Casa Mineral
Located in Mexico City, MX
Large bowl with spinning effect in carved Veneciano white marble. Handmade in México by local craftsmen.
Category

2010s Mexican Modern Decorative Bowls

Materials

Marble

Elipse White Marble Bookend
By Casa Mineral
Located in Mexico City, MX
Bookend in Veneciano white marble. Handmade in Mexico with local craftsman.
Category

2010s Mexican Modern More Desk Accessories

Materials

Marble

  • Elipse White Marble Bookend
  • Elipse White Marble Bookend
  • Elipse White Marble Bookend
  • Elipse White Marble Bookend
H 5.52 in. W 5.52 in. D 7.09 in.
Trulli Black Marble Carved Candleholder Set
By Casa Mineral
Located in Mexico City, MX
Three candleholders in Veneciano white marble. Handmade in Mexico by local craftsmen. Dimensions: Small: 9 D x 9 W x 8 H cm Medium: 10 D x 10 W x 22 H cm Large: 10 D x 10 W x 30 H cm.
Category

2010s Mexican Modern More Candle Holders

Materials

Marble

Tholos Black Marble Carved Candleholder Set
By Casa Mineral
Located in Mexico City, MX
Two candleholders in Monterrey black marble. Handmade in Mexico by local craftsmen. Dimensions: Small 12 D x 12 W x 13 H cm Large 7 D x 7 W x 22 H cm.
Category

2010s Mexican Modern More Candle Holders

Materials

Marble

Cónica Cake Stand in White Marble
By Casa Mineral
Located in Mexico City, MX
Cake stand in carved Veneciano white marble. Handmade in Mexico.
Category

2010s Mexican Modern Serving Pieces

Materials

Marble

  • Cónica Cake Stand in White Marble
  • Cónica Cake Stand in White Marble
  • Cónica Cake Stand in White Marble
  • Cónica Cake Stand in White Marble
H 4.73 in. Dm 11.82 in.
White Marble Plates Set
By Casa Mineral
Located in Mexico City, MX
Plates in Veneciano white marble. Handmade in México by local craftsmen. Dimensions: Small: 20 D x 20 W x 2 H cm Medium: 16 D x 16 W x 2 H cm Large: 12 D x 12 W x 2 H cm.
Category

2010s Mexican Modern Decorative Dishes and Vide-Poche

Materials

Marble

  • White Marble Plates Set
  • White Marble Plates Set
  • White Marble Plates Set
  • White Marble Plates Set
H 0.79 in. Dm 7.88 in.
White Marble Low Pedestal Cylinder
By Casa Mineral
Located in Mexico City, MX
Veneciano white marble carved cylinder. Handmade in Mexico by local craftsmen.
Category

2010s Mexican Modern Planters, Cachepots and Jardinières

Materials

Marble

Cónico White Marble Carved Candleholder Set
By Casa Mineral
Located in Mexico City, MX
Two candleholders in Veneciano white marble. Handmade in Mexico by local craftsmen. Dimensions: Small: 10 D x 10 W x 10 H cm Large: 6 D x 6 W x 15 H cm.
Category

2010s Mexican Modern More Candle Holders

Materials

Marble

White marble carved large Ming
By Casa Mineral
Located in Mexico City, MX
Ming in carved Veneciano white marble. Handmade in México by local craftsmen.
Category

2010s Mexican Modern Decorative Bowls

Materials

Marble

  • White marble carved large Ming
  • White marble carved large Ming
  • White marble carved large Ming
  • White marble carved large Ming
H 3.94 in. Dm 11.82 in.
Albian Type Ammonite Mineral
Located in Paris, FR
Albian Type Ammonite Mineral $702.00 Original specimen of Albian Type Ammonites Mineral. Cretaceous Era Origin Morocco.  
Category

Antique 15th Century and Earlier Moroccan Folk Art Abstract Sculptures

Materials

Precious Stone

  • Albian Type Ammonite Mineral
  • Albian Type Ammonite Mineral
  • Albian Type Ammonite Mineral
  • Albian Type Ammonite Mineral
H 5.11 in. W 6.69 in. D 2.36 in.
Midcentury Geode Onyx Stone Hand Carved Jewelry Bowl or Paperweight, 1960s
Located in Roma, IT
Beautiful and large desk object in natural onyx stone, it is a wonderful handmade paperweight or bowl for rings. This item can nicely be used as an ashtray or in a collection wit...
Category

20th Century Unknown Organic Modern More Desk Accessories

Materials

Agate, Onyx, Quartz

Two Pedestal Coffee Tables in White Marble and White Oak Veneer
By Casa Mineral
Located in Mexico City, MX
Set of two coffee tables with pedestal base in Veneciano white marble, the large one has a Veneciano white marble top and the small one has a white oak veneer top. Available on reque...
Category

2010s Mexican Modern Coffee and Cocktail Tables

Materials

Marble

Ellipse White Marble Magazine Rack
By Casa Mineral
Located in Mexico City, MX
Magazine rack in Veneciano white marble. Handmade in Mexico with local craftsman.
Category

2010s Mexican Modern Magazine Racks and Stands

Materials

Marble

  • Ellipse White Marble Magazine Rack
  • Ellipse White Marble Magazine Rack
  • Ellipse White Marble Magazine Rack
  • Ellipse White Marble Magazine Rack
H 10.63 in. W 10.63 in. D 13.78 in.
Tholos White Marble Medium Side Table
By Casa Mineral
Located in Mexico City, MX
Side table in carved Veneciano white marble.
Category

2010s Mexican Modern Side Tables

Materials

Marble

Black Marble Plates Set
By Casa Mineral
Located in Mexico City, MX
Plates in Monterrey black marble. Handmade in Mexico by local craftsmen. Dimensions: Small: 20 D x 20 W x 2 H cm Medium: 16 D x 16 W x 2 H cm Large: 12 D x 12 W x 2 H cm.
Category

2010s Mexican Modern Decorative Dishes and Vide-Poche

Materials

Marble

  • Black Marble Plates Set
  • Black Marble Plates Set
  • Black Marble Plates Set
  • Black Marble Plates Set
H 0.79 in. Dm 7.88 in.
White Marble Low Cube
By Casa Mineral
Located in Mexico City, MX
Veneciano white marble carved cube. Handmade in Mexico by local craftsmen.
Category

2010s Mexican Modern More Desk Accessories

Materials

Marble

  • White Marble Low Cube
  • White Marble Low Cube
  • White Marble Low Cube
  • White Marble Low Cube
H 1.97 in. W 9.85 in. D 9.85 in.
White Marble Round Board
By Casa Mineral
Located in Mexico City, MX
Round table in carved Veneciano white marble. Handmade in México by local craftsmen.
Category

2010s Mexican Serving Pieces

Materials

Marble

  • White Marble Round Board
  • White Marble Round Board
  • White Marble Round Board
  • White Marble Round Board
H 0.79 in. Dm 11.82 in.
Black Marble Low Pedestal Cylinder
By Casa Mineral
Located in Mexico City, MX
Monterrey black marble carved cylinder. Handmade in Mexico by local craftsmen.
Category

2010s Mexican Modern Planters, Cachepots and Jardinières

Materials

Marble

Two Black Marble Carved Bowls Set
By Casa Mineral
Located in Mexico City, MX
Large and small bowl in carved Monterrey black marble. Set of 2. Handmade in Mexico by local craftsmen. Dimensions: Small: 20 D x 20 W x 10 H cm Large: 30 D x 30 W x 15 H cm.
Category

2010s Mexican Modern Decorative Bowls

Materials

Marble

  • Two Black Marble Carved Bowls Set
  • Two Black Marble Carved Bowls Set
  • Two Black Marble Carved Bowls Set
  • Two Black Marble Carved Bowls Set
H 5.91 in. Dm 11.82 in.
White Veneciano Marble Elipse Coasters Set
By Casa Mineral
Located in Mexico City, MX
Set of four elipse coasters in Veneciano white marble. Handmade in México by local craftsmen.
Category

2010s Mexican Modern Barware

Materials

Marble

  • White Veneciano Marble Elipse Coasters Set
  • White Veneciano Marble Elipse Coasters Set
  • White Veneciano Marble Elipse Coasters Set
  • White Veneciano Marble Elipse Coasters Set
H 0.4 in. W 4.73 in. D 3.55 in.
Black marble carved large Ming
By Casa Mineral
Located in Mexico City, MX
Ming in carved Monterrey black marble. Handmade in Mexico by local craftsmen.
Category

2010s Mexican Modern Decorative Bowls

Materials

Marble

  • Black marble carved large Ming
  • Black marble carved large Ming
  • Black marble carved large Ming
  • Black marble carved large Ming
H 3.94 in. Dm 11.82 in.
White marble carved small Bowl
By Casa Mineral
Located in Mexico City, MX
Small bowl in carved Veneciano white marble. Handmade in México by local craftsmen.
Category

2010s Mexican Modern Decorative Bowls

Materials

Marble

  • White marble carved small Bowl
  • White marble carved small Bowl
  • White marble carved small Bowl
  • White marble carved small Bowl
H 3.94 in. Dm 7.88 in.
Black marble large Cylinder
By Casa Mineral
Located in Mexico City, MX
Plantpot in carved Monterrey black marble. Handmade in México by local craftsmen.
Category

2010s Mexican Modern Planters, Cachepots and Jardinières

Materials

Marble

  • Black marble large Cylinder
  • Black marble large Cylinder
  • Black marble large Cylinder
  • Black marble large Cylinder
H 3.15 in. Dm 9.85 in.
Black marble small Cylinder
By Casa Mineral
Located in Mexico City, MX
Plantpot in carved Monterrey black marble. Handmade in México by local craftsmen.
Category

2010s Mexican Modern Planters, Cachepots and Jardinières

Materials

Marble

  • Black marble small Cylinder
  • Black marble small Cylinder
  • Black marble small Cylinder
  • Black marble small Cylinder
H 3.94 in. Dm 5.91 in.
Half Moon Cake Stand in White Marble
By Casa Mineral
Located in Mexico City, MX
Cake stand in carved Veneciano white marble. Handmade in Mexico.
Category

2010s Mexican Modern Serving Pieces

Materials

Marble

White marble carved Bookend
By Casa Mineral
Located in Mexico City, MX
Bookend in carved Veneciano white marble. Handmade in Mexico.
Category

2010s Mexican Modern More Desk Accessories

Materials

Marble

  • White marble carved Bookend
  • White marble carved Bookend
  • White marble carved Bookend
  • White marble carved Bookend
H 8.27 in. W 6.3 in. D 3.15 in.
Antique Mineral Specimen Collection
Located in Surbiton, Surrey
A rare set of antique mineral specimen jars. Some remnants of labels. Some solid rocks others are powders. Sourced in Holland. Dimensions: Large approximate 20 height...
Category

Early 20th Century Dutch Scientific Instruments

Materials

Glass

  • Antique Mineral Specimen Collection
  • Antique Mineral Specimen Collection
  • Antique Mineral Specimen Collection
  • Antique Mineral Specimen Collection
H 7.88 in. W 3.15 in. D 3.15 in.
Pair of Geode Bookends
Located in Norwalk, CT
This versatile pair of bookends features felt on two sides allowing them to be used horizontally or vertically. As two hemispheres of the same geode, these pieces can be placed flush...
Category

Vintage 1970s Bookends

Materials

Stone

  • Pair of Geode Bookends
  • Pair of Geode Bookends
  • Pair of Geode Bookends
  • Pair of Geode Bookends
H 5.75 in. W 4.75 in. D 3 in.
Purple Half Geode Amethyst with Calcite Formations Shaped as Cathedral or Chapel
Located in London, GB
This is a stunning half geode with a shape often referred to by collectors as a “chapel” or “cathedral”, due to the elongated shape that occurred millions of years ago when trapped b...
Category

Antique 15th Century and Earlier Uruguayan Natural Specimens

Materials

Agate, Amethyst, Quartz

Natural Quartz Mineral Fragment
Located in New York, NY
Natural quartz mineral fragment.
Category

Vintage 1960s Italian Other Natural Specimens

Materials

Quartz

  • Natural Quartz Mineral Fragment
  • Natural Quartz Mineral Fragment
  • Natural Quartz Mineral Fragment
  • Natural Quartz Mineral Fragment
H 11.5 in. W 8 in. D 5.5 in.
Amethyst Quartz Geode Specimen
Located in Palm Beach, FL
Enchanting geode specimen displaying Mother Nature's sculptural prowess with this fine example of Amethyst quartz crystals.  
Category

20th Century Brazilian Organic Modern Natural Specimens

Materials

Amethyst

  • Amethyst Quartz Geode Specimen
  • Amethyst Quartz Geode Specimen
  • Amethyst Quartz Geode Specimen
  • Amethyst Quartz Geode Specimen
H 14 in. W 8 in. D 5 in.
Freestanding Pyrite Mineral, Peru.
Located in London, GB
About Since 1986 Dale has been sourcing the most unique fossils and minerals from around the world and through his company has been supplying leading interior designers and collector...
Category

Antique 15th Century and Earlier Nautical Objects

  • Freestanding Pyrite Mineral, Peru.
  • Freestanding Pyrite Mineral, Peru.
  • Freestanding Pyrite Mineral, Peru.
  • Freestanding Pyrite Mineral, Peru.
H 14.18 in. W 5.91 in. D 5.12 in.
Large Amethyst Double Geode
Located in Pasadena, CA
This is a stunning double or twin geode revealing beautifully colored and large amethyst crystal with wonderful points encased by rock crystal. The double or twinned geode formation ...
Category

Vintage 1950s Brazilian Mid-Century Modern Natural Specimens

Materials

Amethyst

  • Large Amethyst Double Geode
  • Large Amethyst Double Geode
  • Large Amethyst Double Geode
  • Large Amethyst Double Geode
H 21 in. W 18 in. D 9.5 in.
Minerals Or Geodes For Sale on 1stDibs

An assortment of minerals or geodes is available at 1stDibs. Frequently made of metal, wood and glass, all minerals or geodes available were constructed with great care. Find 12835 antique and vintage minerals or geodes at 1stDibs now, or shop our selection of 2003 modern versions for a more contemporary example of this long-cherished furniture. Minerals or geodes have long been popular, with older editions for sale from the 18th Century and newer versions made as recently as the 21st Century. Minerals or geodes made by Mid-Century Modern designers — as well as those associated with Modern — are very popular at 1stDibs. Many minerals or geodes are appealing in their simplicity, but Glashütte Limburg, Andrianna Shamaris and J. T. Kalmar produced popular minerals or geodes that are worth a look.

How Much are Minerals Or Geodes?

Minerals or geodes can differ in price owing to various characteristics — the average selling price at 1stDibs is $2,250, while the lowest priced sells for $8 and the highest can go for as much as $145,000.