mineral

Tumbled honey-yellow calcite

Calcite (CaCO₃)

AI-generated identification · may be incorrect

Pale yellow to cream, translucent in places, with a vitreous-to-pearly luster and visible cleavage surfaces. Calcite has Mohs hardness 3, trigonal crystal structure, perfect rhombohedral cleavage, and specific gravity about 2.71.

Identified October 7, 2026More mineral →

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Physical properties

Formation & geological history

Likely a naturally formed calcite fragment that was mechanically tumbled and polished. Calcite forms in sedimentary and hydrothermal settings across many geological ages, commonly precipitating from calcium-rich water.

Uses & applications

Used as a decorative and collecting stone; calcite is also an important industrial source of lime and cement and is used as a filler in paper, paint, and plastics.

Geological facts

Calcite effervesces in dilute hydrochloric acid and is easily scratched by a copper coin or steel knife. Its strong birefringence can make text viewed through clear pieces appear doubled.

Field identification & locations

Identify by its softness, rhombohedral cleavage, and acid reaction; common localities include limestone and marble deposits worldwide. The photo’s yellow, somewhat mottled appearance is consistent with tumbled calcite, though image alone cannot confirm the mineral.