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.
9.5 x 12.5 x 6.2 cm
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