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Alamosite

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Alamosite
Alamosite (Pb12Si12O36) is a colorless silicate mineral named after the place where it was discovered, ÁlamosSonoraMexico. It is a rare secondary mineral occurring in the oxidized zones of lead-rich deposits. For example, the infobox picture shows its association with black leadhillite.

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Mineralogy Database Dictionary

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Alamosite

General Information:
 Chemical Formula:
PbSiO3
 Composition:
(Molecular Weight = 283.28 gm)
Silicon 9.91 % Si
Lead 73.14 % Pb
Oxygen 16.94 % 
 Empirical Formula:
Pb(SiO3)
 Locality:
TL: Russia, Tyuya-muyun, Alai Mts, Ferghana
Physical Properties:
 Cleavage:
[010] Perfect
 Color:
colorless or white.
 Density:
6.49
 Diaphaniety:
Transparent to Translucent
 Hardness:
4.5 - Between Fluorite and Apatite
 Luster:
Adamantine
 Streak:
white
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