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The distinctive layers were formed in ancient oceans as dissolved iron reacted with oxygen produced by early microorganisms (cyanobacteria)
It's known for its distinctive purple color
This listing is for one fossilized Flexicalymene trilobite fossil within a geode
It was discovered in the 1960s during the mining of bertrandite
Red Hyalite Opal Specimen Mix from Ojuela Mine chevron amethyst The distinctive layers were formedWe were thrilled to acquire a small lot of these Red Hyalite Opal Specimen Mix from Ojuela Mine, which have a fascinating combination of minerals. In regular daylight, these pieces have a beautiful visual contrast. A rich, earthy red from Hematite inclusions coats and stains a matrix of crystalline Calcite and sparkling drusy Quartz. The interplay between the deep red and the bright white is aesthetic all on its own. Draped over parts of the surface,
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