Alamosite

Alamosite (Pb12Si12O36) is a colorless silicate mineral named after the place where it was discovered, √Ālamos, Sonora, Mexico. 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. ...
Found on http://en.wikipedia.org/wiki/Alamosite
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