mineral
Yellow tumbled stone, likely calcite
Calcite (CaCO₃), possibly yellow or honey calcite
AI-generated identification · may be incorrectOpaque pale-yellow stone with a smooth, rounded surface and subdued luster. Calcite has Mohs hardness 3, trigonal crystal structure, and perfect rhombohedral cleavage; the image alone cannot confirm the identification.
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Physical properties
Opaque pale-yellow stone with a smooth, rounded surface and subdued luster. Calcite has Mohs hardness 3, trigonal crystal structure, and perfect rhombohedral cleavage; the image alone cannot confirm the identification.
Formation & geological history
Calcite forms in sedimentary and hydrothermal settings, including limestone and veins, over a wide range of geological ages. This specimen appears mechanically tumbled and polished.
Uses & applications
Tumbled calcite is sold for collecting and decoration; calcite is also used in cement, lime, and as an industrial filler.
Geological facts
Calcite effervesces in dilute acid and is much softer than quartz, useful checks for identifying an unpolished specimen.
Field identification & locations
Yellow calcite occurs in many regions, including Mexico, the United States, and parts of Europe. Confirm by testing a hidden spot for softness or acid reaction; color and appearance are not diagnostic.
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