mineral
Honey calcite crystal fragment
Calcite (CaCO₃), likely honey or amber calcite
AI-generated identification · may be incorrectTypically Mohs hardness 3, vitreous to pearly luster, transparent to translucent amber-brown color, and prominent rhombohedral cleavage; calcite is trigonal in crystal structure. The specimen appears naturally cleaved or partially polished, with internal striations and a pale cleavage face.
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Physical properties
Typically Mohs hardness 3, vitreous to pearly luster, transparent to translucent amber-brown color, and prominent rhombohedral cleavage; calcite is trigonal in crystal structure. The specimen appears naturally cleaved or partially polished, with internal striations and a pale cleavage face.
Formation & geological history
Forms when calcium-rich groundwater precipitates calcite in caves, veins, sedimentary beds, and hydrothermal environments; coloration commonly comes from iron or organic impurities. Calcite occurs from Precambrian to modern deposits, so age cannot be determined from the photograph.
Uses & applications
Used as a carbonate mineral in cement, lime, aggregates, soil treatment, and chemical manufacturing; transparent colored pieces are sold as decorative or educational specimens. It is generally inexpensive as a collector mineral.
Geological facts
Calcite shows strong birefringence: printed text viewed through a clear piece may appear doubled. It reacts readily with dilute hydrochloric acid or vinegar, producing bubbles, though testing may damage the specimen.
Field identification & locations
Common localities include Mexico, Iceland, the United States, Brazil, and China. Confirm with a hardness test against a copper coin or steel, rhombohedral cleavage, and acid reaction; avoid confusing it with harder quartz or fluorite.
