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Formula: (Bi,Fe3+,☐)2Sb5+2O7
Antimonate,
bismuth-bearing mineral
Specific gravity: 7.38
Hardness: 4 to 5
Colour: Yellow to yellow-brown, rarely greenish; brownish in transmitted light
Environments:
Bismutostibiconite is a secondary mineral forming earthy crusts on
quartz, baryte and
sandstone as an
alteration product of bismuth-rich
tetrahedrite-tennantite, associated with
tetrahedrite-tennantite,
chalcopyrite, beyerite,
atelestite, preisingerite,
bismutite,
malachite, azurite and
olivenite
(HOM, AM 69.1190, Mindat).
Localities
There are two co-first recorded localities: the Clara Mine, Oberwolfach, Ortenaukreis, Freiburg Region,
Baden-Württemberg, Germany and Neubulach, Calw, Karlsruhe Region, Baden-Württemberg, Germany.
At the Clara Mine, Oberwolfach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany, bismutostibiconite
is always anhedral and forms yellow to yellowish brown, rarely greenish, earthy crusts on
quartz, baryte and variegated
sandstone. Sometimes it is in association with corroded
tetrahedrite-tennantite.
Bismutostibiconite is a secondary mineral that occurs
as encrustations on samples from the Clara mine; it is an alteration product of
bismuth-bearing
tetrahedrite-tennantite
(AM 69,1190).
Bismutostibiconite from the Clara Mine -
Image
At Neubulach, Calw, Karlsruhe Region, Baden-Württemberg, Germany, Bismutostibiconite is a
secondary mineral that has been found in the mine dumps at
Neubulach in the Black Forest, where it is intergrown with beyerite,
atelestite and
preisingerite. Bismutostibiconite is an alteration product of
bismuth-bearing
tetrahedrite-tennantite
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