metamorphic
White Marble
Recrystallized Calcite (CaCO3)
Hardness: 3 on Mohs scale (can be scratched by a copper penny or steel blade); Color: White to off-white; Luster: Gritty to vitreous/pearly; Crystal structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral in individual crystals; Specific gravity: 2.7
- Color
- White to off-white
- Luster
- Gritty to vitreous/pearly
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Physical properties
Hardness: 3 on Mohs scale (can be scratched by a copper penny or steel blade); Color: White to off-white; Luster: Gritty to vitreous/pearly; Crystal structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral in individual crystals; Specific gravity: 2.7
Formation & geological history
Formed through the regional or contact metamorphism of limestone or dolostone. Under high heat and pressure, the calcite in the original sedimentary rock recrystallizes into a dense interlocking map of crystals.
Uses & applications
Extensively used in construction for tiles and countertops, sculpture, architecture, and as a source of calcium carbonate for industrial fillers and cosmetics.
Geological facts
Pure white marble, like the Carrara variety, results from the metamorphism of very pure limestone. It is acid-sensitive and will fizz vigorously when contact is made with dilute hydrochloric acid or vinegar.
Field identification & locations
Identify in the field by its softness (easily scratched by a knife) and its reaction to acid. Often found in mountainous regions near convergent plate boundaries where significant metamorphic activity has occurred.
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