metamorphic
Marble
Metamorphic carbonate rock (primarily recrystallized calcite, CaCO3)
Hardness: 3 on the Mohs scale. Color: Typically white, but can be pink, gray, green, or black depending on impurities. Luster: Vitreous to greasy. Crystal structure: Granular, interlocking mosaic of calcite or dolomite crystals. Specific gravity: 2.55 to 2.75.
- Hardness
- 3 on the Mohs scale
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 3 on the Mohs scale. Color: Typically white, but can be pink, gray, green, or black depending on impurities. Luster: Vitreous to greasy. Crystal structure: Granular, interlocking mosaic of calcite or dolomite crystals. Specific gravity: 2.55 to 2.75.
Formation & geological history
Formed through the metamorphism of sedimentary carbonate rocks, most commonly limestone or dolostone, under high heat and pressure associated with tectonic plate activity.
Uses & applications
Widely used in sculpture, architecture, building facades, interior flooring, countertops, and decorative items due to its aesthetic appeal and workability.
Geological facts
Pure marble is white and was the preferred medium for ancient Greek and Roman sculptors for statues and architectural monuments like the Parthenon.
Field identification & locations
Can be easily identified in the field by its softness (scratched easily with a knife), granular crystalline texture, and vigorous effervescence (fizzing) when exposed to hydrochloric acid.
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