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Bismite

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Formula:
Bi2O3
System:
Monoclinic
Colour:
Greyish green, greenish ...
Lustre:
Sub-Adamantine, Dull, Earthy
Hardness:
Name:
For Bismuth in its composition.
A polymorph of Sphaerobismoite

NOTE: Numerous localities for bismuth oxides have been reported, but modern confirmation is required, as most have proven to be carbonates, etc.


Classification of Bismite

Approved, 'Grandfathered' (first described prior to 1959)
4.CB.60

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
C : Metal: Oxygen = 2: 3,3: 5, and similar
B : With medium-sized cations
4.3.10.2

4 : SIMPLE OXIDES
3 : A2X3
7.13.12

7 : Oxides and Hydroxides
13 : Oxides of As, Sb and Bi

Physical Properties of Bismite

Sub-Adamantine, Dull, Earthy
Diaphaneity (Transparency):
Opaque
Colour:
Greyish green, greenish yellow to bright yellow
Streak:
Grey to yellow
Hardness (Mohs):
Fracture:
Irregular/Uneven
Density:
8.64 - 9.22 g/cm3 (Measured)    10.4 g/cm3 (Calculated)

Optical Data of Bismite

Type:
Biaxial
RI values:
n = 2.42
Max Birefringence:
δ = 0.000
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
High

Chemical Properties of Bismite

Formula:
Bi2O3
Elements listed in formula:
Analytical Data:
Modern analyses of authenticated material are lacking.

Crystallography of Bismite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 5.851 Å, b = 8.169 Å, c = 7.513 Å
β = 112.94°
Ratio:
a:b:c = 0.716 : 1 : 0.92
Unit Cell Volume:
V 330.70 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals microscopic, rare; earthy to pulverulent, compact granular, massive.
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.232 (10)
2.676 (9)
1.670 (8)
1.640 (8)
1.951 (7.5)
1.740 (7.5)
1.167 (7)
Comments:
Recorded on material from Colavi, Bolivia

Type Occurrence of Bismite

Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, USA (No. 97831)
Geological Setting of Type Material:
An oxidation product of bismuth
Associated Minerals at Type Locality:

Relationship of Bismite to other Species

4.CB.05BrizziiteNaSbO3
4.CB.05CorundumAl2O3
4.CB.05EcandrewsiteZnTiO3
4.CB.05EskolaiteCr2O3
4.CB.05GeikieliteMgTiO3
4.CB.05HematiteFe2O3
4.CB.05IlmeniteFe2+Ti4+O3
4.CB.05KarelianiteV2O3
4.CB.05MelanostibiteMn2+(Sb5+,Fe3+)O3
4.CB.05PyrophaniteMn2+TiO3
4.CB.05AkimotoiteMgSiO3
4.CB.05AuroantimonateAuSbO3
4.CB.05UM1998-11-O-AuHSbAu2+Sb3+O2(OH)
4.CB.05TistariteTi2O3
4.CB.10AvicenniteTl2O3
4.CB.10BixbyiteMn23+O3
4.CB.15Armalcolite(Mg,Fe2+)Ti2O5
4.CB.15PseudobrookiteFe23+TiO5
4.CB.20Zincohögbomite-2N2S(Zn,Al,Fe)3(Al,Fe,Ti)8O15(OH)
4.CB.20Zincohögbomite-2N6S(Zn,Al)7(Al,Fe3+,Ti,Mg)16O31(OH)
4.CB.20Magnesiohögbomite-6N6S(Mg,Al,Fe)3(Al,Ti)8O15(OH)
4.CB.20Magnesiohögbomite-2N3S(Mg,Fe,Zn,Ti)4(Al,Fe)10O19(OH)
4.CB.20Magnesiohögbomite-2N2S(Al,Mg,Fe,Ti)22(O,OH)32
4.CB.20Ferrohögbomite-6N12S[(Fe2+,Mg,Zn)5(Al,Ti,Fe3+)12O23(OH)]6
4.CB.25PseudorutileFe23+Ti34+O9
4.CB.25KleberiteFeTi6O11(OH)5
4.CB.30BerdesinskiiteV23+TiO5
4.CB.30OxyvaniteV3O5
4.CB.35OlkhonskiteCr2Ti3O9
4.CB.35SchreyeriteV23+Ti34+O9
4.CB.40KamiokiteFe22+Mo34+O8
4.CB.40Nolanite(V3+,Fe3+,Fe2+,Ti)10O14(OH)2
4.CB.40RinmaniteMg2Fe4Zn2Sb2O14(OH)2
4.CB.40IseiteMn2Mo3O8
4.CB.40MajindeiteMg2Mo3O8
4.CB.45ClaudetiteAs2O3
4.CB.45StibioclaudetiteAsSbO3
4.CB.50ArsenoliteAs2O3
4.CB.50SenarmontiteSb2O3
4.CB.55ValentiniteSb2O3
4.CB.65SphaerobismoiteBi2O3
4.CB.70SilléniteBi12SiO20
4.CB.75KyzylkumiteTi2V3+O5(OH)
4.CB.80TietaiyangiteFe43+Fe2+TiO9
7.13.1ArsenoliteAs2O3
7.13.2ClaudetiteAs2O3
7.13.3SenarmontiteSb2O3
7.13.4ValentiniteSb2O3
7.13.5CervantiteSb3+Sb5+O4
7.13.6Stibiconite(Sb,O,OH) ?
7.13.7BahianiteAl5Sb35+O14(OH)2
7.13.8Cualstibite-1M(Cu,Al)3(OH)6[Sb5+(OH)6]
7.13.9BismutostibiconiteBi(Sb5+,Fe3+)2O7
7.13.107.13.11StibivaniteSb23+V4+O5
7.13.13SilléniteBi12SiO20

Other Names for Bismite

Name in Other Languages:
Dutch:Bismiet
Italian:Bismite
Russian:Бисмит
Simplified Chinese:铋华
Spanish:Bismita
Ukrainian:Бісміт

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Bismite

Reference List:
Frondel, C. (1943): Mineralogy of the oxides and carbonates of bismuth. American Mineralogist 28, 521-535.

Palache, C., Berman, H. and Frondel, C. (1944): The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc. (New York), 7th edition, revised and enlarged, 599-601.

Corria Neves, J. M., Lopes Nunes, J. E., Sahama, T. G., Lehtinen, M. and von Knorring, O. (1974): Bismuth and antimony minerals in the graphite pegmatites of northern Mozambique. Rev. Cienc. Geol., Ser. A, 7, 1-37. - Chemical Abstracts (1975), 83, 190 (abstract).

Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 60.

Internet Links for Bismite

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https://www.mindat.org/min-682.html
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Localities for Bismite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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