metamorphic
Likely marble or crystalline limestone
Calcite-rich marble (CaCO₃); image-based identification is uncertain
AI-generated identification · may be incorrectCoarse, pale gray to white, with a crystalline, sugary texture and weak luster; calcite hardness is 3 Mohs, with rhombohedral cleavage. The surrounding fragments appear to be mixed quarry or landscaping stone.
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Physical properties
Coarse, pale gray to white, with a crystalline, sugary texture and weak luster; calcite hardness is 3 Mohs, with rhombohedral cleavage. The surrounding fragments appear to be mixed quarry or landscaping stone.
Formation & geological history
Marble forms when limestone recrystallizes during metamorphism; its age depends on the source formation and cannot be determined from the image. Similar material occurs in metamorphic belts worldwide.
Uses & applications
Marble is used as dimension stone, aggregate, and for sculpture and decorative surfaces; calcite-rich stone also serves as a raw material for lime and cement.
Geological facts
Calcite-rich marble reacts with dilute acid, producing visible fizz; dolomitic marble may react weakly unless powdered.
Field identification & locations
Look for interlocking pale crystals and test a small spot with dilute acid; a steel knife can scratch calcite. Common sources include quarries in metamorphic regions; the pictured rough fragments have little individual collector value.
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