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Calcite
Calcite is a Calcium Carbonate, is the most widely distributed mineral of the earth, ...

Physical Characteristics

 

Color: wide range of colors, usually white or colorless
Luster: Vitreous, pearly to resinous
Transparency: Transparent to translucent
Crystal System: Trigonal
Habits: Variable, can include almost any trigonal form possible
Fracture: Conchoideal, irregular/uneven
Cleavage: Perfect in three directions
Hardness: 2.5 - 3
Specific Gravity: 2.7
Streak: White
Other: Soluble in HN03, presents fluorescence, phosphorescence
Occurrence: Mexico (Baja California), USA, Australia