sedimentary

Cave calcite (flowstone/travertine)

Calcite, CaCO₃; likely a cave-deposit speleothem, though exact identification from the photo is uncertain

AI-generated identification · may be incorrect

Cream, tan, and brown, with irregular cavities and rounded, layered surfaces; calcite has Mohs hardness 3, vitreous-to-dull luster, and rhombohedral cleavage. The specimen’s texture suggests mineral-rich water deposited calcite in or around a cavity.

Identified October 15, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms as calcium-carbonate-rich water loses CO₂ and precipitates calcite, commonly in caves or springs. Such deposits can form over thousands to millions of years; age cannot be determined visually.

Uses & applications

Mostly a decorative or educational collector specimen; calcite and travertine also have uses in cement, aggregate, and building stone.

Geological facts

Cave calcite can form stalactites, stalagmites, and flowstone; dilute acid typically fizzes on calcite.

Field identification & locations

Look for calcite’s acid reaction, relatively low hardness, and possible rhombohedral cleavage. Calcite deposits occur in limestone caves and springs worldwide.