metamorphic
White Marble
Recrystallized Calcite / Calcium Carbonate (CaCO3)
Hardness: 3 on Mohs scale; Color: Pure white to off-white; Luster: Vitreous to pearly; Crystal structure: Trigonal (granular texture); Cleavage: Perfect rhombohedral; Specific gravity: 2.7
- Hardness
- 3 on Mohs scale
- Color
- Pure white to off-white
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 3 on Mohs scale; Color: Pure white to off-white; Luster: Vitreous to pearly; Crystal structure: Trigonal (granular texture); Cleavage: Perfect rhombohedral; Specific gravity: 2.7
Formation & geological history
Formed through the regional or contact metamorphism of limestone or dolostone. High heat and pressure cause the original carbonate mineral grains to recrystallize into interlocking calcite crystals. It is found in mountain belts and metamorphic terrains globally.
Uses & applications
Used extensively in construction (tiles, countertops), sculpture (due to its relative softness and isotropic nature), industrial pH neutralizers, and crushed stone for landscaping.
Geological facts
Pure white marble is the result of metamorphism of a very pure (silicate-poor) limestone. Some of the most famous statues in history, including Michelangelo's David, were carved from high-quality white Carrara marble.
Field identification & locations
Identify in the field by its sugary (granular) texture and its reaction to dilute hydrochloric acid (it will effervesce). Commonly found in Italy, Greece, the United States (Vermont/Georgia), and India. Collectors look for high purity and large crystal grains.
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