Alamosite

inosilicate

leadhillite

Formula: PbSiO3 Inosilicate (chain silicate)
Specific gravity: 6.49
Hardness: 4½
Streak: White
Colour: Colourless to white
Solubility: Gelatinises with acids
Environments

Hydrothermal environments

Alamosite is a rare secondary mineral found in the oxidised zone of lead-bearing deposits.

Localities

At the type locality, Álamos, Mexico, alamosite is associated with wulfenite, leadhillite and cerussite (HOM).

At Tsumeb, Namibia, alamosite is associated with leadhillite, anglesite, melanotekite, fleischerite, kegelite and hematite (HOM).

At the Rawhide mine, Arizona, USA, alamosite is associated with melanotekite, shattuckite and wickenburgite (HOM). At Tiger, Arizona, USA, alamosite is associated with diaboleite, phosgenite, cerussite, wulfenite and willemite (HOM).

Common impurities: Al,Fe,Mn,Ca

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