metamorphic
Grey Marble
Recrystallized Calcite-rich Limestone
Hardness: 3-4 (Mohs scale); Color: Cool grey with cloudy white mottling; Luster: Dull/Matte in raw state, vitreous when polished; Crystal structure: Trigonal (granular texture); Cleavage: Perfect rhombohedral in calcite crystals.
- Hardness
- 3-4 (Mohs scale)
- Color
- Cool grey with cloudy white mottling
- Luster
- Dull/Matte in raw state, vitreous when polished
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Physical properties
Hardness: 3-4 (Mohs scale); Color: Cool grey with cloudy white mottling; Luster: Dull/Matte in raw state, vitreous when polished; Crystal structure: Trigonal (granular texture); Cleavage: Perfect rhombohedral in calcite crystals.
Formation & geological history
Formed through the regional metamorphism of limestone or dolostone under high pressure and temperature, causing recrystallization of carbonate minerals. Common in orogenic belts of varying ages from Proterozoic to Cenozoic.
Uses & applications
Widely used for interior flooring, wall cladding, countertops, architectural accents, and sculpture. Valued in modern interior design for its neutral, sophisticated aesthetic.
Geological facts
Marble was used by the Ancient Greeks and Romans for their most famous temples and statues; the word comes from the Greek 'marmaros' meaning 'shining stone'.
Field identification & locations
Identify by its soft surface (strikes with a steel blade), reacting with dilute hydrochloric acid, and the presence of sugary or crystalline grain. Commonly found in quarries in Italy, Turkey, Greece, and the USA.
