Purple Fluorite Octahedron — Display Piece

$43.16
Chemical FormulaCaF₂
Crystal SystemCubic
Mohs Hardness4
Specific Gravity3.18
LusterVitreous
TransparencyTransparent to translucent

Illinois’ Cave-in-Rock fluorite district produced some of history’s greatest fluorite specimens — giant cubic and octahedral crystals in purple, yellow, and green. The cubic cleava…

41 in stock

SKU: TC-MIN-0213
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Description

The universe has 13.8 billion years of history. Some of it fits in your hand. Illinois’ Cave-in-Rock fluorite district produced some of history’s greatest fluorite specimens — giant cubic and octahedral crystals in purple, yellow, and green. The cubic cleavage is perfect in three directions; split any crystal and you get smooth, mirror-perfect faces. The purple comes from color centers caused by natural irradiation.

This specimen originates from Cave-in-Rock, Illinois, USA, one of the world’s most significant localities for this type of material. Collectors and scientists have drawn from this region for generations, and for good reason: the combination of geological conditions here produces specimens of exceptional quality and clarity.

Every specimen is unique. Photographs approximate the visual experience, but the real thing — its weight, its luster under a raking light, the way it catches the corner of your eye — can only be experienced directly.

Formation

This specimen formed through geological processes operating over timescales that dwarf human history. The specific combination of chemistry, temperature, pressure, and time at this locality produced material of exceptional quality that makes it a valued addition to any serious collection.

Locality

Purple Fluorite Octahedron — Display Piece from Cave-in-Rock, Illinois, USA. This locality is known for producing specimens of exceptional quality.

Collector Notes

Dust with a soft brush; avoid water for soft minerals (hardness below 4).