metamorphic
Banded calcite marble
Calcite-rich marble (CaCO₃), likely impure marble
AI-generated identification · may be incorrectTypically Mohs hardness 3, white to cream with brown or gray banding, and a glassy-to-satiny luster; calcite has rhombohedral cleavage and fizzes with dilute hydrochloric acid. The visible specimen is fine- to medium-grained and appears cut or broken from a larger piece.
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Physical properties
Typically Mohs hardness 3, white to cream with brown or gray banding, and a glassy-to-satiny luster; calcite has rhombohedral cleavage and fizzes with dilute hydrochloric acid. The visible specimen is fine- to medium-grained and appears cut or broken from a larger piece.
Formation & geological history
Forms when limestone or dolostone recrystallizes during regional or contact metamorphism, commonly during mountain building. Its exact geological age cannot be determined from the photograph; the original carbonate sediment may be hundreds of millions of years old.
Uses & applications
Used as decorative and architectural stone, tiles, countertops, sculpture, aggregate, and crushed carbonate; attractive pieces may be polished for lapidary display.
Geological facts
Dark streaks commonly represent graphite, mica, amphibole, iron oxides, or other impurities. Marble can resemble quartzite, but calcite marble is softer and reacts vigorously with acid.
Field identification & locations
Common in metamorphic mountain belts worldwide, including Italy, Greece, Turkey, India, Vermont, and Colorado. Confirm with an acid test, scratch comparison, and inspection for interlocking calcite grains.
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