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Brunogeierite


Chemistry: Fe2+2Ge4+O4
Size: 7 mm (largest fragment); see scale bars on images
Owner: W.W. (Bill) Pinch
Photographer: RRUFF Project

Sharp and lustrous, black octahedra of brunogeierite (to 0.1 mm; verified by single crystal XRD), with elongated crystals of zincian siderite and platy hematite (see Photograph 2).

Tsumeb is the type locality for brunogeierite (Ottemann and Nuber, 1972).  This specimen was originally in the collection of John Innes, chief mineralogist at Tsumeb in the early 1980s.  Bill Pinch's label records that this is the structural type specimen from which the material studied by Welch et al. (2001) was taken.

Images courtesy of RRUFF; http//rruff.info/R090012