metamorphic
Marble
Recrystallized Calcite (CaCO3)
Hardness: 3 on Mohs scale; Color: White; Luster: Vitreous to pearly; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral; Specific Gravity: 2.71
- Hardness
- 3 on Mohs scale
- Color
- White
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 3 on Mohs scale; Color: White; Luster: Vitreous to pearly; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral; Specific Gravity: 2.71
Formation & geological history
Formed through the regional or contact metamorphism of sedimentary limestone or dolomite, where heat and pressure cause the carbonate minerals to recrystallize into an interlocking mosaic of crystals.
Uses & applications
Used extensively in construction for flooring and countertops, in sculpture due to its relatively low hardness and translucency, and as a component in whitening agents or pH neutralizers in industry.
Geological facts
The word marble derives from the Greek 'marmaros,' meaning 'shining stone.' Fine-grained white marbles like this have been the preferred medium for classical sculpture since ancient Greek and Roman times.
Field identification & locations
Identify in the field by its white color, ability to be scratched by a copper penny or steel knife, and vigorous effervescence (fizzing) when exposed to a drop of dilute hydrochloric acid.
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