metamorphic
Banded Marble (Egg Carving)
Metamorphic crystalline limestone (predominantly Calcite, CaCO3)
AI-generated identification · may be incorrectMohs hardness 3; color features alternating bands of charcoal gray, dark gray, and white; vitreous to waxy luster when polished; granular/crystalline texture; reacts strongly (effervesces) with dilute hydrochloric acid; specific gravity approx. 2.6-2.8.
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Physical properties
Mohs hardness 3; color features alternating bands of charcoal gray, dark gray, and white; vitreous to waxy luster when polished; granular/crystalline texture; reacts strongly (effervesces) with dilute hydrochloric acid; specific gravity approx. 2.6-2.8.
Formation & geological history
Formed by regional or contact metamorphism of limestone or dolostone containing fine organic matter, clays, or bituminous impurities, which recrystallize under heat and pressure into distinct dark and light foliated bands.
Uses & applications
Commonly carved and polished into ornamental decorative objects such as spheres, eggs, paperweights, as well as architectural tiles, countertops, and fine sculptures.
Geological facts
The gray and black hues in marble are usually caused by tiny amounts of graphite or carbonaceous material preserved from ancient marine life, which aligns along deformation planes during metamorphism.
Field identification & locations
Can be identified by its relative softness (easily scratched by a copper coin or steel knife), visible interlocking calcite grains, distinct planar banding, and vigorous effervescence in acid. Abundantly quarried worldwide, notably in Italy, China, Pakistan, Greece, and the United States.
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