mineral
White/green translucent tumbled mineral fragment
Likely calcite (CaCO₃), possibly fluorite (CaF₂) or glass-like feldspar; visual identification is uncertain
AI-generated identification · may be incorrectPale mint-white, translucent, smooth polished surfaces, vitreous to waxy luster, and apparent planar cleavage. If calcite, hardness is 3 and specific gravity about 2.71; fluorite is harder (Mohs 4) with specific gravity about 3.18.
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Physical properties
Pale mint-white, translucent, smooth polished surfaces, vitreous to waxy luster, and apparent planar cleavage. If calcite, hardness is 3 and specific gravity about 2.71; fluorite is harder (Mohs 4) with specific gravity about 3.18.
Formation & geological history
Likely a cut or tumbled natural mineral fragment formed in hydrothermal veins or sedimentary cavities; exact age and formation setting cannot be determined from the photograph.
Uses & applications
Used as a decorative or collecting specimen; calcite and fluorite also have industrial uses in cement, lime, steelmaking, optics, and chemical processing.
Geological facts
The wedge-like shape and translucent pale color are compatible with calcite cleavage, but the specimen could also be manufactured glass or another mineral; an acid test and hardness test would help distinguish them.
Field identification & locations
Check for effervescence with dilute hydrochloric acid (calcite), cubic cleavage (fluorite), and scratches on glass (hardness above about 5.5). Common sources include Mexico, China, the United States, and Brazil.
