Calcite: Mineral information, data and localities.
Formula: CaCO3. Colour: White, Yellow, Red, Orange, Blue, Green, Brown, Gray etc. Lustre: Vitreous, Sub-Vitreous, Resinous, Waxy, Pearly. Hardness: 3. Specific Gravity: 2.7102. Crystal System: Trigonal. Member of: Calcite Group. Name: Ancient name. Named as a mineral by Gaius Plinius Secundus (Pliny the elder) in 79 from Calx, Latin for Lime.