Chrombismite Mineral Data

Chrombismite Mineral Data

General Chrombismite Information

Chemical Formula:

Bi16CrO27

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

Empirical Formula:

Bi₁₆CrO₂₇

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

IMA Status:

Approved IMA 1995 (Dana # Added)

Locality:

Jialu mine, Luonan, Shaanxi province, China. Link to MinDat.org Location Data.

Name Origin:

Named for the main elements present in the mineral.

Synonym:

IMA1995-044

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Chrombismite Crystallography

Axial Ratios:

a:c = 1:1.99329

Cell Dimensions:

a = 8.649, c = 17.24, Z = 2; V = 1,289.64 Den(Calc)= 9.86

Crystal System:

TetragonalSpace Group: I 4,I 4-,I 4/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.19(1)(123), 1.655(0.55)(503,433), 2.73(0.4)(310),1.715(0.3)(219),

Physical Properties of Chrombismite

Cleavage:

None

Color:

Brown, Orange, Yellowish brown.

Density:

9.8

Diaphaniety:

Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Columnar - Forms columns

Hardness:

3-3.5 - Calcite-Copper Penny

Luster:

Adamantine

Streak:

brownish yellow

Optical Properties of Chrombismite

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

Optical Data:

Uniaxial (+), w=2.5, e=2.55, bire=0.0500.

Calculated Properties of Chrombismite

Electron Density:

r_electron=8.03 gm/cc
note: r_Chrombismite=9.80 gm/cc.

Fermion Index

Fermion Index = 0.00134
Boson Index = 0.99866

Photoelectric:

PE_Chrombismite=1,716.24 barns/electron
U=PE_Chrombismite x r_electron=13779.93 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Chrombismite is Not Radioactive

Chrombismite Classification

Dana Class:

4.3.13.2 (4)Simple Oxides

(4.3)with a cation charge of 3+ (A+++2 O3)

(4.3.13)Dana Group

4.3.13.1 Sphaerobismoite Bi2O3 P 4₂212 or P 4₁/n Tetra

4.3.13.2 Chrombismite ! Bi16CrO27 I 4,I 4-,I 4/m Tetra

Strunz Class:

IV/C.02-50 IV - Oxides

IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)

IV/C.02 - Arsenolite - Sillenite series

IV/C.02-10 Arsenolite As2O3 F d3m 4/m 3 2/m

IV/C.02-20 Senarmontite Sb2O3 F d3m 4/m 3 2/m

IV/C.02-30 Bismite Bi2O3 P 2₁/c 2/m

IV/C.02-35 Sphaerobismoite Bi2O3 P 4₂212 or P 4₁/n Tetra

IV/C.02-40 Sillenite Bi12SiO20 I 23 2 3

IV/C.02-50 Chrombismite Bi16CrO27 I 4,I 4-,I 4/m Tetra

Other Chrombismite Information

References:

NAME( AmMin, Vol 82, p 1261) PHYS. PROP.(Am.Min.,Vol.82,p1261,1997) OPTIC PROP.(Am.Min.,Vol.82,p1261,1997)

See Also:

Links to other databases for Chrombismite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Chrombismite

Bi16CrO27
Dana No: 4.3.13.2 Strunz No: IV/C.02-50
Locality:

Notes: