Breunnerite

Breunnerite is a variety of magnesite, with a magnesium/iron ratio of 90/10 to 70/30.

Breunnerite
Breunnerite from Bolzano. Italy
Composition
(Mg, Fe) CO 3

It has been described by Wilhelm Karl Ritter von Haidinger in samples of Pfitsch pass, Zamsergrund and Großer Mt Greiner, Zemmgrund, two cities of the Ziller Valley, Tyrol, Austria.[1]

References
  1. Mohs, Frederick; Haidinger, William (1825). Treatise on mineralogy, or, The natural history of the mineral kingdom. 1. Edinburg. p. 411.
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