mineral
Pink calcite (likely)
Calcite — calcium carbonate, CaCO₃
AI-generated identification · may be incorrectPale pink, translucent, and probably glassy to pearly; calcite has Mohs hardness 3, perfect rhombohedral cleavage, and noncubic crystals. The small rounded shape suggests a tumbled or naturally worn fragment; pink color may come from manganese or iron impurities.
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Physical properties
Pale pink, translucent, and probably glassy to pearly; calcite has Mohs hardness 3, perfect rhombohedral cleavage, and noncubic crystals. The small rounded shape suggests a tumbled or naturally worn fragment; pink color may come from manganese or iron impurities.
Formation & geological history
Forms in limestone, marble, hydrothermal veins, and cave deposits through precipitation from calcium-rich fluids; specimens may range from ancient sedimentary formations to modern cavity growth. The photograph alone cannot establish its geological age or confirm the identification.
Uses & applications
Used industrially for cement, lime, aggregate, soil treatment, and chemical manufacture; attractive transparent pieces are collected or made into cabochons. It is generally inexpensive as a small specimen.
Geological facts
Calcite strongly effervesces with dilute hydrochloric acid or vinegar, although a weak reaction may be difficult to see on a polished surface. It shows obvious double refraction when clear and cleaves into rhombohedra.
Field identification & locations
Likely identification: pale pink color, soft surface, rhombohedral cleavage, and acid fizz; gypsum or rose quartz are alternatives, with rose quartz being harder (Mohs 7) and lacking calcite’s cleavage. Common sources include Mexico, the United States, Peru, and China.
