Hemihedrite

General Information:
 Chemical Formula:
Pb10Zn(CrO4)6(SiO4)2F2
 Composition:
(Molecular Weight = 3,055.52 gm)
Zinc 2.14 % Zn
Chromium 10.21 % Cr
Silicon 1.84 % Si
Lead 67.81 % Pb
Oxygen 16.76 % O 
Fluorine 1.24 % F 
 Empirical Formula:
Pb10Zn(CrO4)6(SiO4)2F2
 IMA Status:
Approved IMA 1967
Physical Properties:
 Color:
orange, brown, or black.
 Density:
6.42
 Hardness:
3 - Calcite
 Luster:
Vitreous (Glassy)
 Streak:
saffron
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