metamorphic
Marble
Recrystallized Limestone (CaCO3)
Hardness: 3 on Mohs scale; Color: Grayish-white; Luster: Pearly to sub-vitreous; Crystal Structure: Trigonal/Rhombohedral crystals; Cleavage: Perfect rhombohedral (in calcite grains); Specific Gravity: 2.7
- Hardness
- 3 on Mohs scale
- Color
- Grayish-white
- Luster
- Pearly to sub-vitreous
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Physical properties
Hardness: 3 on Mohs scale; Color: Grayish-white; Luster: Pearly to sub-vitreous; Crystal Structure: Trigonal/Rhombohedral crystals; Cleavage: Perfect rhombohedral (in calcite grains); Specific Gravity: 2.7
Formation & geological history
Formed when sedimentary carbonate rocks (limestone or dolostone) are subjected to high heat and pressure, causing recrystallization into a dense interlocking mosaic of calcite or dolomite crystals.
Uses & applications
Commonly used in construction, sculpture, flooring, and as an industrial source of calcium carbonate for paper and paint production.
Geological facts
Marble has been used since antiquity for famous sculptures like Michelangelo's David and the Parthenon. Pure white marble is the result of metamorphism of very pure limestone.
Field identification & locations
Identify in the field by its softness (can be scratched by a copper penny or steel) and its vigorous reaction to dilute hydrochloric acid. It often feels 'sugary' or granular to the touch.
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