metamorphic
Marble
Recrystallized Calcite (CaCO3)
Hardness: 3 on Mohs scale; Color: White with grey/blue veining; Luster: Vitreous to pearly; Crystal structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific Gravity: 2.7
- Hardness
- 3 on Mohs scale
- Color
- White with grey/blue veining
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 3 on Mohs scale; Color: White with grey/blue veining; Luster: Vitreous to pearly; Crystal structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific Gravity: 2.7
Formation & geological history
Formed when limestone is subjected to the heat and pressure of metamorphism. It is composed primarily of the mineral calcite and usually contains other minerals, such as clay minerals, micas, quartz, pyrite, and iron oxides.
Uses & applications
Extensively used for sculpture, as a building material in flooring and counter tops (such as Carrara marble), and in pharmaceuticals as an antacid.
Geological facts
The word 'marble' derives from the Ancient Greek 'mármaros', which means 'crystalline rock' or 'shining stone'. Pure white marble is the result of metamorphism of a very pure limestone or dolomite protolith.
Field identification & locations
Can be identified by its softness (it can be scratched by a copper penny or steel knife) and its effervescence (fizzing) when in contact with dilute hydrochloric acid. Commonly found in mountainous regions worldwide.
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