Defernite

General Information:
 Chemical Formula:
Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x=0,5)
 IMA Status:
Approved IMA 1978
Physical Properties:
 Cleavage:
[010] Perfect, [100] Distinct
 Color:
colorless or reddish brown.
 Density:
2.5
 Diaphaniety:
Transparent
 Hardness:
3 - Calcite
 Luster:
Vitreous (Glassy)
 Streak:
white
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