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Bleasdaleite from
Lake Boga granite quarry, Lake Boga, Swan Hill Rural City, Victoria, Australia

Locality type:Quarry
Comments:"In April 1995 a boulder was broken open of pegmatite in the quarry, exposing copper mineralisation consisting of massive supergene chalcocite partially altered to a suite of secondary copper and silver minerals, including one containing Ca,Cu,Bi,P and Cl. (Bleasdaleite).
The chalcocite in the bleasdaleite-bearing boulder forms massive patches up to about 5 cm across, occupying space between large orthoclase crystals. The rock around these patches is stained green, possibly due to malachite. Thin sections show that much of the chalcocite has been corroded and altered to veinlets of covellite. Secondary minerals have precipitated on the corroded surface of the chalcocite-covelliet. Pseudomalachite and chalcosiderite/turquoise form globules and crusts, while rare ulrichit, libethenite, torbernite and iodargyrite are present as scattered crystals with dimensions less than 1 mm. Bleasdaleite itself occurs as thin, dark brown scaly crusts and hemispherical clusters up to about 0.1 mm across. Scanning electron microscopy reveals delicate tabular crystals forming open rosette-like clusters and linings. The crystals reach up to about 20 micron across but are less than 1 micron thick. The lustre on broken surfaces is resinous, streak pale brown. Thin sections show bleasdaleite crystals are transparent and also reveal a well developed (001) cleavage."
Validity:Valid - Type Locality
References:B. Birch, A. Pring and U. Kolitsch (1999): Bleasdaleite, (Ca,Fe3+)2Cu5(Bi,Cu)(PO4)4¬(H2O,OH,Cl)13, a new mineral from Lake Boga, Victoria, Australia. Australian Journal of Mineralogy 5, 69-75; [AmMin 85:1321];
Associated Minerals Based on Photo Data:
Turquoise1 photo of Bleasdaleite associated with Turquoise at this locality.
Malachite1 photo of Bleasdaleite associated with Malachite at this locality.
Mineral Data:Click here to view Bleasdaleite data
Locality Data:Click here to view Lake Boga granite quarry, Lake Boga, Swan Hill Rural City, Victoria, Australia
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