General Information:
Chemical Formula:
PbFe+++6(SO4)4(OH)12
Composition:
(Molecular Weight = 1,130.62 gm)
Iron 29.64 % Fe
Hydrogen 1.07 % H
Lead 18.33 % Pb
Sulfur 11.34 % S
Oxygen 39.62 % O
Empirical Formula:
PbFe3+6(SO4)4(OH)12
Locality:
Cooks Pead district, Luna County, New Mexico.
Name Origin:
Named after its chemical composition (a variety of jarosite with Pb replacing K).
Physical Properties:
Cleavage:
[0001] Distinct
Color:
yellowish brown, dark brown, or golden brown.
Density:
3.6 - 3.67, Average = 3.63
Diaphaniety:
Translucent to subtranslucent
Habits:
Tabular - Form dimensions are thin in one direction., Concretionary - Rounded massive fine-grained materials.,
Hardness:
1.5-2 - Talc-Gypsum
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Dull
Streak:
pale brown
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