metamorphic
Banded Marble (Egg Carving)
Metamorphosed Limestone (predominantly CaCO3)
AI-generated identification · may be incorrectHardness 3 on Mohs scale; dark grey to black with white/light-grey foliated banding; vitreous to pearly luster when polished; granular crystalline texture composed of interlocking calcite grains; specific gravity ~2.6-2.8.
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Physical properties
Hardness 3 on Mohs scale; dark grey to black with white/light-grey foliated banding; vitreous to pearly luster when polished; granular crystalline texture composed of interlocking calcite grains; specific gravity ~2.6-2.8.
Formation & geological history
Formed by regional or contact metamorphism of sedimentary limestone or dolomite under elevated heat and pressure, causing recrystallization of carbonate minerals and dynamic stretching of organic/carbonaceous impurity layers into bands.
Uses & applications
Commonly carved and polished into decorative objects like eggs, spheres, bookends, sculptures, as well as architectural tiles, countertops, and ornamental stonework.
Geological facts
Marble reacts vigorously by fizzing when exposed to dilute hydrochloric acid. The dark bands are often derived from ancient organic carbon (graphite) present in the original sedimentary marine muds.
Field identification & locations
Identifiable by its soft nature (readily scratched by a steel nail/copper coin), distinct banding/veining, and effervescence in acid. Common in metamorphic belts worldwide including Italy, Pakistan, Greece, China, and the US.
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