Dynamic Formation with Thick Agatised Borders

The central element of this geode has been preserved with two windows on each side, revealing gorgeous calcite formations sat on a blanket of differentially tinted amethystine quar...

Bordered by a thick, blueish agate layer, this wonderful slice preserves an interior of large white quartz crystals with a prominent centr...

A half polished geode with a thick agatised border. The inside covered by deep purple amethyst crystals and 2 beautiful calcite formations at the centre, one of them covered with a b...

This beautiful half geode has a wonderful blue-brown banded agate border with a thick base of white quartz differentiating to deep amethyst at the tips. A small section of orange ...

A beautiful amethyst cluster with polished borders revealing multiple agatised layers. The interior of this specimen has a wonderful frosty appearance with purple amethyst, creamy ...

This heavily agatiised medium sized geode contains 6 “windows” from which the beautiful amethyst interior can be appreciated. A spectacular display piece. This piece was legally...

Prehistoric Brazilian thick agate geode on stand. White center with brown border. Metal stand measures 5" x 3.5". One of several from a large collecti...

Gogotte formation circa 30 Million y/o Measures : 42 x 21 x 63 cm. A magnificent example of a gogotte formation, composed of thick swirls and fo...

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...

A magnificent example of a gogotte formation composed of thick swirls and folds of sparkling sandstone. Discovered in the Oligocene sand dunes of Fon...

'Louis XIV' Gogotte Formation Measures: circa 30 Million y/o 105 x 76 x 15 cm A magnificent example of a gogotte formation, nicknamed Louis XIV, 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 forms we now know as gogottes. These are rare and are only found sporadically, several metres buried underground. 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 name “gogotte” was coined by French geologist Claude Guillemin (1923- 1994), inspired by the children’s book series Babar the Elephant...

An amethyst crystal with central calcite piece.