Arsenogoyazite, Hematite
Clara Mine, Oberwolfach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany
SEM micrograph (BSE mode) of a white, micaceous pustule of chemically impure arsenogoyazite (contains minor to trace amounts of Ca, F, Ba, K, Fe, Si and S) overgrowing, as a thin crust, a black Mn oxide that coats a void in white, coarse-grained baryte. The arsenogoyazite is sprinkled with tiny globular hematite aggregates (bright) which impart a ...
© Uwe Kolitsch