mineral
Stalactitic calcite (cave-calcite slice)
Calcite, CaCO₃
AI-generated identification · may be incorrectPredominantly white to honey-brown calcite with a radiating, fibrous-to-crystalline texture and gray central staining. Mohs hardness 3; vitreous to pearly luster; trigonal crystal system; perfect rhombohedral cleavage; specific gravity about 2.7.
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Physical properties
Predominantly white to honey-brown calcite with a radiating, fibrous-to-crystalline texture and gray central staining. Mohs hardness 3; vitreous to pearly luster; trigonal crystal system; perfect rhombohedral cleavage; specific gravity about 2.7.
Formation & geological history
Likely formed as calcite precipitated from carbonate-rich groundwater in a cave or cavity, building a layered stalactitic growth; the exact age and setting cannot be determined from the image.
Uses & applications
Used as a decorative and collector specimen; calcite is also an important source of lime and cement and is used as aggregate and filler.
Geological facts
Calcite fizzes in dilute hydrochloric acid and can show strong double refraction in clear crystals.
Field identification & locations
Look for radiating growth bands, pale calcite crystals, and calcite’s softness and acid reaction; cave calcite occurs worldwide in limestone and other carbonate terrains.
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