Mineralogy Database

Chrombismite Mineral Data

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General Chrombismite Information

Help on Chemical  Formula: Chemical Formula: Bi16CrO27
Help on Composition: Composition: Molecular Weight = 3,827.67 gm
   Chromium   1.36 %  Cr    2.61 % CrO3
   Bismuth   87.36 %  Bi   97.39 % Bi2O3
   Oxygen    11.29 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Bi16CrO27
Help on Environment: Environment: The mineral occurs as a primary phase associated with pyrite, chalcopyrite, and gold in mesothermal quartz veins. The mineral occurs as a primary phase associated with pyrite, chalc opyrite, and gold in mesothermal quart
Help on IMA Status: IMA Status: Approved IMA 1995 (Dana # Added)
Help on Locality: Locality: Jialu mine, Luonan, Shaanxi province, China. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the main elements present in the mineral.
Help on Synonym: Synonym: IMA1995-044

Chrombismite Image

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Comments: B&W image showing the relationship of grains of chrombismite to grains of chalcopyrite, pyrite and gold. (CanMin, v35:35).
Location: Quartz veins in the Jialu gold nine, Luonan County, Shaanxi Province, China. Scale: Feld of view: 0.12 mm.
© Canadian Mineralogist

Chrombismite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.99329
Help on Cell Dimensions: Cell Dimensions: a = 8.649, c = 17.24, Z = 2; V = 1,289.64 Den(Calc)= 9.86
Help on Crystal System: Crystal System: Tetragonal Space Group: I 4,I 4-,I 4/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.19(1)(123), 1.655(0.55)(503,433), 2.73(0.4)(310),1.715(0.3)(219),

Physical Properties of Chrombismite

Help on Cleavage: Cleavage: None
Help on Color: Color: Brown, Orange, Yellowish brown.
Help on Density: Density: 9.8
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Columnar - Forms columns
Help on Hardness: Hardness: 3-3.5 - Calcite-Copper Penny
Help on Luster: Luster: Adamantine
Help on Streak: Streak: brownish yellow

Optical Properties of Chrombismite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1547,KPDmeas= 0.1556,KC= 0.1578
Ncalc = 2.55 - 2.56
Help on Optical Data: Optical Data: Uniaxial (+), w=2.5, e=2.55, bire=0.0500.

Calculated Properties of Chrombismite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=8.03 gm/cc
note: Specific Gravity of Chrombismite =9.80 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0013455524
Boson Index = 0.9986544476
Help on Photoelectric: Photoelectric: PEChrombismite =1,716.24 barns/electron
U=PEChrombismite x rElectron Density=13779.93 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chrombismite is Not Radioactive

Chrombismite Classification

Help on  Dana Class: Dana Class: (04)Simple Oxides
  (04.03)with a cation charge of 3+ (A+++2 O3)
  (04.03.13)Dana Group Sphaerobismoite Bi2O3 P 42212 or P 41/n Tetra Chrombismite! Bi16CrO27 I 4,I 4-,I 4/m Tetra
Help on  Strunz Class: Strunz Class: 04.CC.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.C - Metal:Oxygen = 2:3, 3:5, and Similar
  04.CC -With large and medium-sized cations
04.CC.05 Chrombismite! Bi16CrO27 I 4,I 4-,I 4/m Tetra

Other Chrombismite Information

Help on References: References: NAME( AmMin, Vol 82, p 1261) PHYS. PROP.(Am.Min.,Vol.82,p1261,1997) OPTIC PROP.(Am.Min.,Vol.82,p1261,1997)
Help on See Also: See Also: Links to other databases for Chrombismite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 04.CC.05





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