Black Amethyst - Specimen European mineral specimen Coltaneia Trilobites first appeared during

Coltaneia Trilobites first appeared during the Early Cambrian and went extinct during the Permian mass extinction

The specimen shows a mix of natural crystal faces and carefully reworked surfaces

That is why specimens from this region often preserve the overall body form so well

Santa Eulalia has a long mining history

this Montana corundum offers a fascinating look at one of Earth's most durable and visually captivating minerals

Black Amethyst - Specimen European mineral specimen Coltaneia Trilobites first appeared duringMined from: Rio Grande do Sul, Brazil Description: This one of a kind Black Amethyst specimen from Brazil features a dramatic natural geode face with a deep charcoal purple to nearly black crystal surface. The specimen has a rugged, sculptural outline with sparkling druzy formations, small quartz points, and subtle lavender, smoky, and grey undertones that show through the darker Amethyst interior. Pale quartz edging and natural brown grey basalt