metamorphic
Marble
Recrystallized Calcite / Dolomite (CaCO3)
Hardness: 3 on Mohs scale. Color: White to light gray. Luster: Vitreous to pearly. Crystal structure: Trigonal (granular/sugary texture). Cleavage: Perfect rhombohedral in individual crystals. Specific gravity: 2.7.
- Hardness
- 3 on Mohs scale
- Color
- White to light gray
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 3 on Mohs scale. Color: White to light gray. Luster: Vitreous to pearly. Crystal structure: Trigonal (granular/sugary texture). Cleavage: Perfect rhombohedral in individual crystals. Specific gravity: 2.7.
Formation & geological history
Formed from the regional or contact metamorphism of sedimentary limestone or dolostone. Under high pressure and heat, the carbonate mineral grains recrystallize into a dense, interlocking mosaic of crystals.
Uses & applications
Used widely in construction (tiles, countertops), sculpture, alkaline acid neutralizers, and as a calcium supplement in animal feed.
Geological facts
Marble has been used since ancient times; the Taj Mahal is constructed entirely of white marble. It is susceptible to acid rain because the calcium carbonate reacts quickly with acids.
Field identification & locations
Identify in the field by its 'sugary' crystalline appearance and its reaction (fizzing) when exposed to a drop of dilute hydrochloric acid. It can be scratched easily with a copper penny.
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