Zinc-manganese carbonates from Broken Hill, New South Wales release_t4l4vwzjnrb53nu6esbei4in4q

by W. D. Birch

Published in Mineralogical magazine by Mineralogical Society.

1986   Volume 50, Issue 355, p49-53

Abstract

<jats:title>Abstract</jats:title> Specimens of honey-brown to pinkish-brown globular carbonates encrusting concretionary goethite–coronadite from the oxidized zone at Broken Hill, New South Wales, have compositions in the rhodochrosite–smithsonite series. This may be the first extensive natural occurrence of this solid-solution series. Growth of the carbonates occurred in zones which have near uniform composition. The ratio MnCO<jats:sub>3</jats:sub>/(MnCO<jats:sub>3</jats:sub> + ZnCO<jats:sub>3</jats:sub>) for each zone bears a linear relationship to the measured <jats:italic>d</jats:italic> spacing for the 10<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="gif" xlink:href="S0026461X00029261_inline01" xlink:type="simple" />4 X-ray reflections. Because cerussite is the only other mineral associated with the Zn-Mn carbonates and because of an absence of detailed locality information, the paragenetic significance of these minerals cannot be determined. The solutions depositing them may have been derived from the near-surface equivalents of the Zinc Lode horizons.
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