metamorphic
White Marble
Recrystallized Calcite (CaCO3)
Hardness: 3 on Mohs scale; Color: Pure white to off-white; Luster: Vitreous to pearly; Crystal structure: Trigonal (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 (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 calcium carbonate to recrystallize into an interlocking mosaic of calcite crystals.
Uses & applications
Commonly used in sculpture, architecture (cladding and flooring), countertops, and as a calcium supplement in agriculture or industry.
Geological facts
Famous statues like Michelangelo's David were carved from high-quality white marble (Carrara). It has been used since classical antiquity for its softness and relative isotropy.
Field identification & locations
Identify in the field by its white color and ability to be scratched by a copper penny or steel knife. It will effervesce (fizz) vigorously when in contact with dilute hydrochloric acid. Found globally in mountainous regions where tectonic activity occurred.
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