Calcite 
Calcite (CaCO3) is a mineral from the carbonate group.It is a very common mineral which is found worldwide,it occurs in Igneous,Sedimentary,Metamorphic Rocks.
Calcite has the following properties:
1.Hardness:3 On the Moh Scale.
2.Color:White or colorless but can have a wide range of colors
(Violet,yellow,blue,green,red,grey,brown,black,orange etc.) Due to impurities.
3.Specific gravity:2.71.
4.Cleavage:Perfect {1011} on all three directions,Rhom bohedral.
5.Habit:Many crystal habits some of which are (Massive,concretionary,granular,rhombohedral,crystalline,talactitic)
6.Fracture:Conchoidal.
7.Luster:Vitreous (Glassy) or Pearly.
8.Streak:White.
Some other properties that Calcite shows are:
A.Solubility:Dissolves and reacts with acid.
B.Diaphaneity:Transparent,Translucent,Opaque.
C.Double Refraction.
D.Tenacity:Brittle.
E.Optical properties:Uniaxial.
F.Crystal system:Trigonal.
G.Twinning:Twin Twinning
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