General Information:
Chemical Formula:
Na2Ca(Mg,Fe++,Mn)7(PO4)6
IMA Status:
Approved IMA 1979
Physical Properties:
Cleavage:
[???] Perfect
Color:
dark brown.
Density:
3.35
Diaphaniety:
Transparent to Translucent
Hardness:
4.5 - Between Fluorite and Apatite
Luster:
Vitreous (Glassy)
Streak:
light brown
More details...