metamorphic
Pink Marble
Recrystallized Limestone (Calcium Carbonate, CaCO3)
Hardness: 3 (Mohs scale), Color: Pink with white and grey streaks, Luster: Vitrous to pearly when polished, Crystal structure: Trigonal/Hexagonal (granular), Cleavage: Perfect rhombohedral (in individual calcite crystals)
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Physical properties
Hardness: 3 (Mohs scale), Color: Pink with white and grey streaks, Luster: Vitrous to pearly when polished, Crystal structure: Trigonal/Hexagonal (granular), Cleavage: Perfect rhombohedral (in individual calcite crystals)
Formation & geological history
Formed when limestone is subjected to high heat and pressure during regional metamorphism, causing the calcite to recrystallize into an interlocking mosaic of crystals. The pink color is often caused by trace impurities of iron or manganese.
Uses & applications
Commonly used in architecture for decorative tile, sculpture, countertops, and luxury construction. High-purity white or pink marble is also ground for medicinal or agricultural use.
Geological facts
Marble is a 'non-foliated' metamorphic rock. The word 'marble' comes from the Greek 'marmaros,' which means 'shining stone.' Some of the world's most famous statues, like Michelangelo's David, are made of high-quality marble.
Field identification & locations
Identify in the field by its characteristic softness (can be scratched by a copper penny or steel knife) and its vigorous reaction (fizzing) when exposed to dilute hydrochloric acid. It is commonly found in mountainous regions with a history of tectonic activity.
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