mineral
Tumbled cream-colored stone, possibly quartz or calcite
Indeterminate from photograph; likely microcrystalline quartz (SiO₂) or calcite (CaCO₃)
AI-generated identification · may be incorrectSmooth, rounded, opaque cream-yellow surface with subdued vitreous-to-waxy luster and minor brown inclusions. Quartz has Mohs hardness 7 and no cleavage; calcite has hardness 3 and prominent rhombohedral cleavage.
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Physical properties
Smooth, rounded, opaque cream-yellow surface with subdued vitreous-to-waxy luster and minor brown inclusions. Quartz has Mohs hardness 7 and no cleavage; calcite has hardness 3 and prominent rhombohedral cleavage.
Formation & geological history
Likely a naturally occurring pebble subsequently tumbled and polished; quartz or calcite formed in hydrothermal veins, sedimentary deposits, or cavities, with age dependent on its host rock.
Uses & applications
Used as a craft, lapidary, or decorative stone; comparable pieces are common in tumbling mixes and generally have little commercial value.
Geological facts
The image alone cannot reliably distinguish quartz from calcite, limestone, yellow jasper, or another pale stone.
Field identification & locations
Test hardness: quartz scratches glass, while calcite is scratched by a steel knife and fizzes strongly with dilute hydrochloric acid or vinegar (if calcite-rich). Common sources include quartz-rich gravels and carbonate formations worldwide.
