Tsumoite, Yecoraite
Hebbersfors, Sandfors, Skellefte mining district, Skellefteå, Västerbotten County, Sweden
1 mm size hexagonal plate of dark-grey metallic with green to purple-violet iridicence tsumoite with ideal composition BiTe into small vug in quartz vein. Edges of the crystal replaced by brownish-yellow iron-bismuth tellurate, yecoraite. Associating minerals invisible on the photo are gold and scheelite. Collected by Aksel Osterlof. Pavel M. ...
© Pavel M. Kartashov collection & photo.