metamorphic
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
Hardness: 3 on Mohs scale; Color: White to light gray; Luster: Vitreous to pearly; Crystal structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral (not visible in massive form); 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/Hexagonal; Cleavage: Perfect rhombohedral (not visible in massive form); Specific gravity: 2.7
Formation & geological history
Formed through the regional or contact metamorphism of sedimentary carbonate rocks, like limestone or dolostone, under intense heat and pressure which causes recrystallization.
Uses & applications
Used extensively in construction (tiles, countertops), sculpture, architecture, and as an industrial filler or additive due to its calcium carbonate content.
Geological facts
Pure white marble is the result of metamorphism of a very pure (silicate-poor) limestone. The characteristic swirls and veins of many colored marble varieties are usually due to various mineral impurities.
Field identification & locations
Identify in the field by its sugary (saccharoidal) texture and its reaction to cold dilute hydrochloric acid (it will fizz). Commonly found in mountainous regions such as Carrara, Italy or the Appalachian Mountains.
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