Exceptional Large Amethyst Cluster with Calcite Formation

A magnificent example of a gogotte formation composed of thick swirls and folds of sparkling sandstone. Discovered in the Oligocene sand dunes of Fontainebleau, France, formed circa 30 million years before present or later. The incredible, almost otherworldly appearance of gogottes may easily be mistaken for the work of a most talented artist. In fact, these sandstone sculptures are entirely natural in origin. They have been found in multiple locations but those from Fontainebleau, such as the present example, are the most remarkable. Thirty-five million years ago, a sea covered what is now the forest of Fontainebleau, and dunes of exceptionally fine and homogenous sand formed. As silica-rich water filtered through this sand, it turned into stone. The flow of water finely modelled the sandstone into the aesthetic concretions we now know as gogottes. These are rare and are only found sporadically several metres deep into the ground. They owe their sparkling white appearance to the extreme and unmatched purity of the Fontainebleau sand, sometimes reaching a composition of 99.9% silica. Each of them is unique – a masterpiece slowly fashioned by the hands of Nature. The intriguing name of “gogotte” was coined by French geologist Claude Guillemin (1923- 1994), who was inspired by the children’s book series Babar the Elephant. In one of the books, a group of monsters called Gogottes are shown hiding behind rocks. These rocks reminded Guillemin of the sandstone concretions...

“This 149-gram slice of the Gadamis 004 lunar meteorite contains a wide variety of sizes of light-colored angular anorthositic clasts. These silicate c...

NWA 12759 Stone, Chondrite - L5 18.3 KG “This specimen of the NWA 12759 L5 chondrite has a smooth posterior fusion crust where meteoritic melt pooled as the rock descended through the atmosphere and was heated by friction with molecules of air. The meteorite is from the L-chondrite asteroid that was destroyed by an energetic collision 470 million years ago.” Dr Alan E. Rubin, PhD Department of Earth, Planetary, and Space Sciences, UCLA Detached from its parent body by a mighty impact, this large, oriented meteorite travelled over a hundred million miles through space before falling to Earth in the North African desert. Beautiful regmaglypts radiate from the apex of its cone shaped nose. These elongated dimples formed when streaks of superheated molten rock streamed off the meteor’s surface as it blazed through the atmosphere. The entire piece is coated in a glossy, umber-coloured fusion crust and close examination reveals remnants of encrusted, orange dirt. Whilst most meteors tumble as they travel through the Earth’s atmosphere, oriented meteorites...

Stony-iron, pallasite - PMG Circa 4.5 Billion y/o Weight: 34.68 kg Height (including base): 53 cm Width: 29 cm A magnificent and extremely sculptural specimen of the Seymchan meteor...

A magnificent, stunning African sable antelope with large curved ringed horns or antlers mounted on a wrought iron stand. The piece is mounted as a scul...

Antique patinated Mercury glass Madonna with child. Turn of the century / early 20th century. This is a wonderful and large mercury glass Madonna with child figurine...

Giant Mounted Gypsum Minerals Cluster from China

Decorative amethyst geode in 22-karat gold leaf Shows a old internal repair not very visible to photograph. Offered at Gallery Girasole.