Teineite

General Information:
 Chemical Formula:
CuTeO3·2(H2O)
 Composition:
(Molecular Weight = 275.17 gm)
Copper 23.09 % Cu
Tellurium 46.37 % Te
Hydrogen 1.47 % H 
Oxygen 29.07 % O 
 Empirical Formula:
Cu(TeO3)·2(H2O)
Physical Properties:
 Cleavage:
[001] Distinct, [100] Indistinct
 Color:
blue gray, sky blue, or dark blue.
 Density:
3.8
 Hardness:
2.5 - Finger Nail
 Streak:
bluish white
More details...