metamorphic
Marble
Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)
Hardness: 3 on Mohs scale; Color: typically white but can be varied; Luster: vitreous to pearly; Crystal structure: Trigonal; Cleavage: Perfect rhombohedral; Specific gravity: 2.7
- Hardness
- 3 on Mohs scale
- Color
- typically white but can be varied
- Luster
- vitreous to pearly
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Physical properties
Hardness: 3 on Mohs scale; Color: typically white but can be varied; Luster: vitreous to pearly; Crystal structure: Trigonal; Cleavage: Perfect rhombohedral; Specific gravity: 2.7
Formation & geological history
Formed when limestone is subjected to the heat and pressure of metamorphism, causing recrystallization of the original carbonate mineral grains. Common in mountain building zones.
Uses & applications
Extensively used for sculpture, as a building material in architecture, and as an ingredient in cosmetics, paint, and paper. High-purity white marble is often ground for calcium carbonate supplements.
Geological facts
The Taj Mahal is constructed entirely of white marble. Due to its calcium carbonate content, it will fizz (effervesce) when in contact with dilute hydrochloric acid.
Field identification & locations
Identify in the field by its sugary texture, relative softness (can be scratched by a copper penny or steel knife), and reaction to acid. Often found in proximity to limestone and metamorphic belts.
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