metamorphic
Marble (polished)
Recrystallized Calcite (CaCO3)
Hardness: 3 on Mohs scale; Color: Pure white; Luster: Vitreous to pearly; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral (often obscured by polishing); Specific gravity: 2.7
- Hardness
- 3 on Mohs scale
- Color
- Pure white
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 3 on Mohs scale; Color: Pure white; Luster: Vitreous to pearly; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral (often obscured by polishing); Specific gravity: 2.7
Formation & geological history
Formed from the metamorphism of sedimentary limestone or dolostone under intense heat and pressure, causing the original carbonate grains to recrystallize into an interlocking mosaic of calcite crystals.
Uses & applications
Used in sculpture, architecture, flooring, tabletops, and as a material for decorative tiles or jewelry components.
Geological facts
Pure white marble is the result of metamorphism of a very pure limestone precursor. It has been the preferred medium for major sculptors since classical times because of its relative softness and isotropism (homogeneity).
Field identification & locations
Identify in the field by its softness (can be scratched by a steel blade) and its effervescence (fizzing) when in contact with dilute hydrochloric acid. Commonly found in mountainous regions with a history of tectonic activity.
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