metamorphic
Marble
Recrystallized Calcite (CaCO3)
Hardness: 3 on Mohs scale; Color: White with grey veining; Luster: Sub-vitreous to pearly; Crystal structure: Trigonal/Hexagonal (granular); Cleavage: Perfect rhombohedral in calcite grains
- Hardness
- 3 on Mohs scale
- Color
- White with grey veining
- Luster
- Sub-vitreous to pearly
Identified More metamorphic →
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Physical properties
Hardness: 3 on Mohs scale; Color: White with grey veining; Luster: Sub-vitreous to pearly; Crystal structure: Trigonal/Hexagonal (granular); Cleavage: Perfect rhombohedral in calcite grains
Formation & geological history
Formed from the regional metamorphism of limestone or dolostone under high pressure and temperature, causing recrystallization of carbonate minerals. Found in ancient mountain belts and geologic shields.
Uses & applications
Extensively used as a building material for flooring, countertops, and wall cladding, as well as in sculpture and as an architectural decorative stone.
Geological facts
The grey streaks, often called veins, are usually made of mineral impurities such as clay, silt, sand, or iron oxides that were present as layers in the original limestone. The region of Visakhapatnam (near the provided coordinates) is known for Eastern Ghats metamorphic rocks.
Field identification & locations
Identify by its soft surface (can be scratched by a steel knife) and its vigorous reaction (effervescence) to weak acids like vinegar. In the field, it appears as massive, non-foliated or weakly banded outcrops.
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