metamorphic
Marble
Recrystallized Calcite / Metamorphosed Limestone (CaCO3)
Hardness: 3 on Mohs scale; Color: typically white with dark grey/black mineral veining; Luster: sugary or vitreous; Crystal structure: Trigonal/Hexagonal (microcrystalline); Cleavage: Perfect rhombohedral
- Hardness
- 3 on Mohs scale
- Color
- typically white with dark grey/black mineral veining
- Luster
- sugary or vitreous
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Physical properties
Hardness: 3 on Mohs scale; Color: typically white with dark grey/black mineral veining; Luster: sugary or vitreous; Crystal structure: Trigonal/Hexagonal (microcrystalline); Cleavage: Perfect rhombohedral
Formation & geological history
Formed when limestone is subjected to intense heat and pressure from regional metamorphism, leading to the recrystallization of calcite grains.
Uses & applications
Primarily used in construction, sculpture, flooring, and as a source of calcium carbonate in industrial fillers and agriculture.
Geological facts
The word marble derives from the Greek 'marmaros,' meaning 'shining stone.' Famous uses include the Taj Mahal and Michelangelo's David.
Field identification & locations
Identify in the field by its softness (it can be scratched by a steel knife) and its reaction to weak acid (it will fizz). Commonly found in mountainous regions near tectonic plate boundaries.
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