Cafarsite

General Information:
 Chemical Formula:
Ca8(Ti,Fe++,Fe+++,Mn)6-7(As+++O3)12·4(H2O)
 IMA Status:
Approved IMA 1966
Physical Properties:
 Cleavage:
None
 Color:
brownish yellow, brownish black, dark brown, or dark red.
 Density:
3.9
 Diaphaniety:
Translucent to Opaque
 Hardness:
5.5-6 - Knife Blade-Orthoclase
 Luster:
Sub Metallic
 Streak:
yellowish brown
More details...