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Formula: Bi native element
Specific gravity: 9.7 - 9.8
Hardness: 2 to 2½
Streak: Lead grey
Colour: Silver white
Solubility: Slightly soluble in hydrochloric acid, readily soluble in sulphuric and nitric acid
Common impurities: Fe,Te,As,S,Sb
Environments:
Pegmatites
Metamorphic environments
Hydrothermal environments
Bismuth occurs in pegmatites and as an unaltered
primary mineral in
hypothermal (high temperature), tin ore veins. It is widespread, although not in large amounts, in
contact metamorphic formations, where it generally occurs in
chalcopyrite aggregates, and more rarely in
arsenopyrite (Ramdohr p379-380).
In pegmatites associated minerals include chalcopyrite,
pyrrhotite, arsenopyrite,
pyrite, bismuthinite,
molybdenite, sphalerite,
galena, wolframite and
cassiterite, as well as cubanite and
cobaltite.
In vein deposits associated minerals include skutterudite,
safflorite, löllingite,
bismuthinite, silver,
nickeline and breithauptite
(Ramdohr p379-380).
Localities
At the Emmons pegmatite, Greenwood, Oxford county, Maine, USA, bismuth has been found as 1-2 mm grains, often coated with
beyerite and associated with bismuthinite.
The Emmons pegmatite is an example of a highly evolved
boron-lithium-cesium-tantalum
enriched pegmatite
(R&M 94.6.505).
Bismuth-bearing minerals include:
Alloys
maldonite
Sulphides
bismuthinite
tetradymite
Sulphide/Selenides
laitakarite
Selenides
guanajuatite
Tellurides
hedleyite
michenerite
tellurobismuthite
montbrayite
Bismuthides
froodite
kotulskite
Sulphosalts
aikinite
cosalite
emplectite
galenobismutite
lillianite
matildite
pavonite
wittichenite
Oxides
bismite
bismutotantalite
sillénite
sphaerobismoite
uranosphaerite
Halogenides
bismoclite
Carbonates
beyerite
bismutite
Phosphates
mrázekite
petitjeanite
Arsenates
asselbornite
atelestite
mixite
preisingerite
rooseveltite
walpurgite
Vanadates
dreyerite
namibite
pucherite
schumacherite
Molybdates
koechlinite
Nesosilicates
eulytine
Phyllosilicated
bismutoferrite
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