Iron-bearing Magnesite (Var: Breunnerite)
Großer Greiner, Finkenberg, Schwaz District, Tyrol, Austria
14.0 x 9.3 x 8.8 cm. Ferroan magnesite (variety breunnerite) is rare from this less well-known area of the Ziller Valley. It has a Mg:Fe atomic ratio ranging from 90:10 to 70:30 and was originally reported from several Austrian localites (MINDAT). Moderately lustrous, sharp, jet-black rhombs, to 2.5 cm, are richly scattered on the striking, large, ...
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