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Formula: Fe3+2Bi(SiO4)2(OH)
Phyllosilicate (sheet silicate), bismuth-bearing mineral
Crystal System: Monoclinic
Specific gravity: 4.47 measured, 5.09 calculated
Hardness: 6
Colour: yellow, green
Common impurities: Al,As
Environments
Bismutoferrite is probably of hydrothermal origin
(HOM).
At Johanngeorgenstadt, Erzgebirge District, Saxony, Germany, bismutoferrite is associated with
quartz, bismuth,
galena and silver ores
(HOM).
At the type locality, Schneeberg, Erzgebirge District, Saxony, Germany, bismutoferrite occurs in veins cutting
shale, associated with
quartz/chalcedony,
bismuth, cobaltite,
arsenopyrite and
chlorargyrite
(HOM, Dana).
At the Lodi #4 claim, California, USA, bismutoferrite is associated with
clinobisvanite
(HOM).
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