Bismutite


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bismutite

[′biz·məd‚īt]
(mineralogy)
(BiO)2CO3 A dull-white, yellowish, or gray, earthy, amorphous mineral consisting of basic bismuth carbonate. Also known as bismuth spar.

Bismutite

 

a mineral of the oxycarbonate bismuth group. Its chemical composition is Bi2(CO3)O2. It crystallizes in a tetragonal arrangement. Bismutite forms powdery masses or, less often, fibrous crusts consisting of submicroscopic crystalline particles. Bismutite’s hardness on the mineralogical scale measures 3–3.75; its density varies between 7,400 and 8,300 kg/m3. Its color ranges from grayish white or greenish yellow to brown and grey. It forms as a result of the oxidation of native bismuth, as well as bismuthinite, during the action of surface carbonated solutions. Quartz, topaz, and arsenopyrite, among others are bismutite’s associated minerals. Deposits of bismutite are found in Transbaikalia, Kazakhstan, and Middle Asia. Abroad they are found in Czechoslovakia, the German Democratic Republic, Mexico, the USA, and other countries.

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1 -mm) scaly bismutite and bismoclite crystals occur as an early constituent in some vugs with chlorargyrite, arsentsumebite and wulfenite, at the Reward mine.
Bismutite has been reported from Llallagua by Petrov et al.
azurite, bismutite, brochantite, lanthanite-(Ce), malachite and wroewolfite, are of secondary origin and may have formed there as a result of post-mining processes.
Occurrence: Associated minerals are: quartz, cobaltneustadtelite, preisingerite and goethite; rarely with mixite, zeunerite and bismutite.
Occurrence: Associated minerals are: quartz, neustadtelite, preisingerite and goethite; rarely with mixite, zeunerite and bismutite.
Bismuthcontaining minerals found include native bismuth, bismite, bismutite, bismuthinite, and beyerite (Jahns and Wright, 1951).
Occurrence: Associated minerals are: pucherite, schumacherite, bismutite and hechtsbergite.
Bismutite has been identified as an alteration product in the Bor pit.
Additional accessory minerals identified in the Malkhanskiy district include manganocolumbite, monazite, ixiolite, struverite, bismuthinite, bismutite, topaz, spessartine, cesian beryl, biotite, amazonite and fluorite.
18) Kaolinite + Montmorillonite + Bismutite + Quartz
bismutite, chabazite, chrysocolla, cuprite, goethite, gypsum, huntite, malachite, molybdite, nontronite, stilbite and thulite.
It is commonly associated with other bismuth minerals including native bismuth, bismuthinite, bismutite, bismite, beyerite, eulytite, pucherite, schumacherite and clinobisvanite.