Chalcedony with Chrysocolla
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Chalcedony with chrysocolla D.50728. Arizona, USA. 9.5 x 12.5 x 6.2 cm.. Registered 1996. Albert Chapman Collection
Image: Stuart Humphreys
© Australian Museum
© Australian Museum
These smooth, round masses of chalcedony with dispersed sky-blue copper silicate mineral chrysocolla line a cavity in oxidised copper ore. Chalcedony is a microcrystalline variety of quartz (silicon dioxide) and the chrysocolla (copper silicate with water) has added its own intense blue colour.
This specimen was found in the 1940s, and Albert Chapman acquired it from American collector Earl L Calvert in 1948.
Specimen details
Origin
Arizona, USA
Size
9.5 x 12.5 x 6.2 cm
Date
Registered 1996
Collection number
D.50728
Collection
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