Formula: CaCO3 Colour: Colorless to white or grey, often stained various hues by impurities, such as blue, green, red or violet; colourless in transmitted light.
Lustre: Vitreous, Resinous Hardness: 3½ – 4 Specific Gravity: 2.947 Crystal System: Orthorhombic Member of: Aragonite Group
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