General Information:
Chemical Formula:
(Fe++,Pb)As+++++2O8
Composition:
(Molecular Weight = 309.25 gm)
Iron 17.16 % Fe
Arsenic 48.45 % As
Lead 3.35 % Pb
Oxygen 31.04 % O
Empirical Formula:
Fe2+0.95Pb0.05As2O6
Environment:
Oxidized ore bodies containing lead, iron, and As bearing sulfosalts. Found with zincian siderite in the "germanite section" at Tsumeb.
IMA Status:
Approved IMA 1970
Locality:
In a boulder of ore found at Tsumeb, Namibia.
Name Origin:
Named for F. Ludlow Smith III and C. Locke Key, mineral collectors and dealers in New Jersy.
Physical Properties:
Cleavage:
[011] Good, [???] Good
Color:
copper red.
Density:
4.35 - 4.4, Average = 4.37
Habits:
Acicular - Occurs as needle-like crystals., ,
Hardness:
1.5-2 - Talc-Gypsum
Luster:
Subadamantine
Streak:
light brown
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