metamorphic
Likely marble fragment
Calcite-rich marble (recrystallized CaCO₃)
AI-generated identification · may be incorrectWhite to gray, fine- to medium-grained, with a sugary texture and faint veining; vitreous to dull luster. Calcite has Mohs hardness 3, rhombohedral cleavage, and specific gravity about 2.7; it should fizz with dilute hydrochloric acid or vinegar if sufficiently fresh.
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Physical properties
White to gray, fine- to medium-grained, with a sugary texture and faint veining; vitreous to dull luster. Calcite has Mohs hardness 3, rhombohedral cleavage, and specific gravity about 2.7; it should fizz with dilute hydrochloric acid or vinegar if sufficiently fresh.
Formation & geological history
Forms when limestone undergoes heat and pressure during regional or contact metamorphism, recrystallizing calcite; ages vary widely from Precambrian to recent geologic settings.
Uses & applications
Used as dimension stone, countertops, sculpture, tile, aggregate, and lime feedstock; this small unpolished fragment has minimal commercial value.
Geological facts
The image is consistent with marble, though similarly colored limestone or calcite-rich rock cannot be ruled out from appearance alone.
Field identification & locations
Common in metamorphic mountain belts and quarry districts worldwide, including Italy, Greece, Vermont, India, and Turkey. Look for interlocking calcite grains, weak veining, and acid effervescence; a glass scratch test can help distinguish it from harder quartz-rich rocks.
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