mineral
Yellow calcite
Calcite (CaCO₃)
AI-generated identification · may be incorrectHoney-yellow, translucent to opaque, with a vitreous to pearly luster; Mohs hardness 3, trigonal crystal system, and perfect rhombohedral cleavage. The rounded, smooth surface appears tumbled or naturally water-worn.
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Physical properties
Honey-yellow, translucent to opaque, with a vitreous to pearly luster; Mohs hardness 3, trigonal crystal system, and perfect rhombohedral cleavage. The rounded, smooth surface appears tumbled or naturally water-worn.
Formation & geological history
Forms when calcium-carbonate-rich fluids precipitate in veins, cavities, and sedimentary settings; it also occurs in limestone and marble. Calcite forms across many geological ages, so age cannot be determined from the image.
Uses & applications
Commonly collected and used for ornamental objects and carvings; calcite is also an important raw material for cement, lime, and other industrial products.
Geological facts
Calcite effervesces in dilute hydrochloric acid and is strongly birefringent in clear crystals. Yellow coloration commonly comes from trace impurities.
Field identification & locations
Identify by its relatively soft surface, rhombohedral cleavage, and acid reaction; common localities include limestone regions and mineral veins worldwide. A tumbled specimen like this typically sells for about $2–$10 USD.
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Pegmatite with Tourmaline and Quartz
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Epidote
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metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
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