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Smithsonian National Museum of Natural History

Fluorite with calcite

Photograph of fluorite on calcite (NMNH R17986) from the National Mineral Collection
Photo by Chip Clark. Click to zoom.
Catalog Number NMNH R17986-00
Locality Asturias, Spain

From the exhibit

These fluorite crystals show two sets of crystal faces: square faces that define the cubes and rough faces along the edges. Temperature and chemical composition during growth determined which faces dominated.

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