Queitite

General Information:
 Chemical Formula:
Pb4Zn2(SiO4)(Si2O7)(SO4)
 Composition:
(Molecular Weight = 1,315.89 gm)
Zinc 9.94 % Zn
Silicon 6.40 % Si
Lead 62.98 % Pb
Sulfur 2.44 % S 
Oxygen 18.24 % O 
 Empirical Formula:
Pb4Zn2(SiO4)(Si2O7)(SO4)
 IMA Status:
Approved IMA 1979
Physical Properties:
 Cleavage:
[010] Indistinct, [001] Indistinct
 Color:
colorless, white, or light yellow.
 Density:
6.07
 Hardness:
4 - Fluorite
 Luster:
Greasy (Oily)
 Streak:
white
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