Chalcedony with Chrysocolla

  • Updated
    29/06/26
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    2 minutes
Chalcedony with chrysocolla D.50728 Click to enlarge image
Chalcedony with chrysocolla D.50728. Arizona, USA. Dimensions: 9.5 x 12.5 x 6.2 cm. Registered 1996. Albert Chapman Collection. Image: Stuart Humphreys
© 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.

Specimen details

  • Origin

    Arizona, USA

  • Size

    9.5 x 12.5 x 6.2 cm

  • Date

    Registered 1996

  • Collection number

    D.50728

  • Collection

    Albert Chapman Collection.

How it became part of the AM Mineralogy Collection

This specimen was found in the 1940s, and Albert Chapman acquired it from American collector Earl L Calvert in 1948.