metamorphic
Marble
Metamorphosed Limestone / Calcite or Dolomite
Hardness: 3-4 (Mohs), Color: White with grey veining, Luster: Vitreous to dull (polished here), Crystal structure: Granular mosaic of calcite crystals, Cleavage: Perfect in calcite grains, Specific gravity: 2.7
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Physical properties
Hardness: 3-4 (Mohs), Color: White with grey veining, Luster: Vitreous to dull (polished here), Crystal structure: Granular mosaic of calcite crystals, Cleavage: Perfect in calcite grains, Specific gravity: 2.7
Formation & geological history
Formed by regional or contact metamorphism of limestone or dolostone. Found in convergent plate boundaries or near igneous intrusions.
Uses & applications
Widely used in construction for countertops, flooring, cladding, and sculpture.
Geological facts
The grey veining is typically caused by mineral impurities such as clay, silt, sand, iron oxides, or chert which were originally present as grains or layers in the limestone.
Field identification & locations
Identify by its reaction (fizz) with dilute hydrochloric acid, relative softness (can be scratched by a knife), and typical veined appearance. Found globally in mountainous regions.
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