metamorphic
Marble
Recrystallized Carbonate Rock (CaCO3)
Hardness: 3 on Mohs scale; Color: typically white, gray, or cream with darker veins; Luster: dull to pearly (waxy when polished); Crystal structure: Trigonal (granular); Cleavage: rhombohedral in calcite crystals but often massive; Specific gravity: 2.7
- Hardness
- 3 on Mohs scale
- Color
- typically white, gray, or cream with darker veins
- Luster
- dull to pearly (waxy when polished)
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 3 on Mohs scale; Color: typically white, gray, or cream with darker veins; Luster: dull to pearly (waxy when polished); Crystal structure: Trigonal (granular); Cleavage: rhombohedral in calcite crystals but often massive; Specific gravity: 2.7
Formation & geological history
Formed through the regional or contact metamorphism of sedimentary carbonate rocks, specifically limestone or dolostone. Heat and pressure cause recrystallization of calcite or dolomite grains. Periods of formation vary throughout geological history but are common in orogenic (mountain-building) belts.
Uses & applications
Extensively used in construction for flooring, countertops, and wall cladding. Highly valued in sculpture and architecture. Used as a soil conditioner in agriculture and as a calcium supplement in animal feed.
Geological facts
The world-famous 'Carrara marble' from Italy was used by Michelangelo for his sculptures. Pure white marble is the result of metamorphism of a very pure limestone or dolomite protolith, while characteristic veins are caused by mineral impurities like clay or iron oxides.
Field identification & locations
Identified in the field by its softness (can be scratched by a steel blade) and its effervescence (fizzing) when in contact with dilute hydrochloric acid. Commonly found in mountainous regions such as the Alps, Appalachians, and the Himalayas.
More like this
