metamorphic
White Marble
Recrystallized Calcite Rock (CaCO3)
Hardness: 3 on Mohs scale (can be scratched by a steel blade). Color: Pure white. Luster: Vitreous to pearly or dull. Crystal Structure: Trigonal (granular texture). Cleavage: Perfect rhombohedral in individual crystals. Specific Gravity: 2.7 to 2.8.
- Hardness
- 3 on Mohs scale (can be scratched by a steel blade)
- Color
- Pure white
- Luster
- Vitreous to pearly or dull
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Physical properties
Hardness: 3 on Mohs scale (can be scratched by a steel blade). Color: Pure white. Luster: Vitreous to pearly or dull. Crystal Structure: Trigonal (granular texture). Cleavage: Perfect rhombohedral in individual crystals. Specific Gravity: 2.7 to 2.8.
Formation & geological history
Formed through the regional or contact metamorphism of sedimentary limestone or dolostone. Exposure to high heat and pressure causes the original calcite grains to recrystallize into an interlocking mosaic of crystals.
Uses & applications
Used extensively in construction (countertops, tiles), sculpture (renowned architectural material), as a soil conditioner, and as a filler in paper and paints.
Geological facts
Pure white marble is the result of metamorphism of a very pure (silicate-poor) limestone. Famous sculptures like Michelangelo's David are made from Carrara marble. It can be millions of years old depending on the regional geology.
Field identification & locations
Identify in the field by its softness (scratchable with a knife) and its reaction to weak hydrochloric acid (it will effervesce/fizz). Commonly found in mountainous regions near tectonic plate boundaries.
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