Anglesite
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Formula:   PbSO4   mineral photo

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Crystal:   Orthorhombic  
Hardness:   2.5-3  
Spec. Gr.:   6.38  
Streak:   Uncolored  
Cleavage:   Good Basal  
Location:   Tsumeb, Nambia  

Anglesite is a soft, heavy, secondary mineral usually formed by the weathering of galena. Anglesite crystals are mostly white, but may be tinged yellow, gray, green, and sometimes blue. Crystals are in the orthorhombic system, and vary in habit, usually tabular, prismatic or equant. Its composition is lead sulfate. It associates with galena, cerussite, gypsum, sulfur, wulfenite, pyromorphite, linarite, cerargyrite (chlorargyrite), and smithsonite. Fine anglesite crystals have come from Dundas, Tasmania; Eureka, Nevada; Broken Hill, New South Wales, Australia; the Wheatley mine, Chester County, Pennsylvania; and especially at Tsumeb, Namibia. The specimen displayed in the UCSB collection clearly shows the "V" of a twinned crystal, and displays a inch tabular blue wulfenite crystal near its base.

Bibliography: Bancroft, Peter, Gem and Crystal Treasures, 1984, pp. 335-343.

Vanders, Iris, Mineral Recognition, 1967, pp. 231-232.



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