General Information:
Chemical Formula:
Pb7(Fe,Cu)Al3GeSi12O36·(OH,H2O)6
Composition:
(Molecular Weight = 2,678.79 gm)
Aluminum 3.02 % Al
Iron 1.56 % Fe
Silicon 12.58 % Si
Copper 0.59 % Cu
Germanium 2.71 % Ge
Hydrogen 0.30 % H
Lead 54.14 % Pb
Oxygen 25.09 % O
Empirical Formula:
Pb7Fe2+0.75Cu0.25Al3GeSi12O36(OH)4·2(H2O)
Environment:
Corroded Pb-Zn ores of the lower oxidation zone.
IMA Status:
Approved IMA
Locality:
TL: Tsumeb, Namibia.
Name Origin:
Named to honor Mathew Rogers, fist European prospetor at Tsumeb, Namibia.
Physical Properties:
Cleavage:
[???] Perfect
Color:
colorless, white, or light green yellow.
Density:
4.7
Diaphaniety:
Translucent
Hardness:
2 - Gypsum
Luster:
Vitreous - Pearly
Streak:
white
More details...