metamorphic
White Marble
Recrystallized Calcite (CaCO3)
Hardness: 3 on Mohs scale (can be scratched by a copper coin or knife); Color: Pure white with occasional grey or black veining (impurities); Luster: Subvitreous to pearly; Crystal structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific gravity: 2.7
- Hardness
- 3 on Mohs scale (can be scratched by a copper coin or knife)
- Luster
- Subvitreous to pearly
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Physical properties
Hardness: 3 on Mohs scale (can be scratched by a copper coin or knife); Color: Pure white with occasional grey or black veining (impurities); Luster: Subvitreous to pearly; Crystal structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific gravity: 2.7
Formation & geological history
Formed from the metamorphism of limestone or dolostone under high temperature and pressure. This process causes the original carbonate mineral grains to recrystallize into an interlocking mosaic of calcite crystals.
Uses & applications
Extensively used in construction for flooring and countertops, sculpture, architecture (monuments), and as a soil conditioner or pH neutralizer in agriculture.
Geological facts
Many of the world's most famous statues, including Michelangelo's David, are carved from Carrara marble. It is chemically identical to limestone but structurally much denser and more decorative.
Field identification & locations
Identify in the field by its softness (easily scratched compared to quartz) and its strong effervescent reaction (fizzing) when exposed to a drop of dilute hydrochloric acid. Commonly found in mountainous regions with a history of tectonic activity.
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