Andamooka Opal Specimen
Lot 1403
Andamooka Opal Specimen
Sold for US$ 400 inc. premium
Auction Details
Lot Details
Andamooka Opal Specimen
Andamooka, South Australia
Like all matrix opal material from this region this specimen was sugar treated by the miners before being honed to a superb level of polish. The process—a classic and long-standing tradition—involves soaking the original rough specimen in a sugar solution and then boiling it in acid to deposit carbon in the available pore spaces, resulting in a dark background. The procedure is performed to reveal the excellent pinpoint fire and play-of-color of the mineral within the matrix. The present specimen has a polished face which reveals its green play of color, while the obverse has been left with the natural surface of the matrix. Measures 2 1/2 x 2 1/2 x 3/4in
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  1. Claudia Florian, G.J.G
    Auction Administration - Natural History
    Bonhams
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