Sphaerobismoite Mineral Data

General Sphaerobismoite Information

Chemical Formula:

Bi2O3

Composition:

Molecular Weight = 449.96 gm

Bismuth 92.89 % Bi 103.56 % Bi₂O₃

Oxygen 7.11 % O

______ ______

100.00 % 103.56 % = TOTAL OXIDE

Empirical Formula:

Bi₂O₂

Environment:

In the secondary oxidation zone. Dimorphous with bismite.

IMA Status:

Approved IMA 1995

Locality:

Neubulach and Wittichen, Black Forest, Germany. Link to MinDat.org Location Data.

Name Origin:

For the form of the aggregates and the composition.

Name Pronunciation:

Sphaerobismoite + Pronunciation

Synonym:

IMA1993-009

Sphaerobismoite Crystallography

Axial Ratios:

a:c = 1:0.7995

Cell Dimensions:

a = 8.08, c = 6.46, Z = 4; V = 421.75 Den(Calc)= 7.09

Crystal System:

Tetragonal Space Group: P 4₂212 or P 4₁/n

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

By Intensity(I/I_o): 3.16(1), 5.73(0.7), 1.902(0.6),

Physical Properties of Sphaerobismoite

Cleavage:

None

Color:

Green, Yellowish, Gray.

Density:

7.17

Diaphaneity:

Transparent to Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

4 - Fluorite

Luster:

Subadamantine

Streak:

white

Optical Properties of Sphaerobismoite

Gladstone-Dale:

CI meas= -0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1629,KPDmeas= 0.1611,KC= 0.1584
Ncalc = 2.12 - 2.14

Optical Data:

Uniaxial (+), w=2.13, e=2.18, bire=0.0500.

Calculated Properties of Sphaerobismoite

Electron Density:

Bulk Density (Electron Density)=5.80 gm/cc
note: Specific Gravity of Sphaerobismoite =7.17 gm/cc.

Fermion Index:

Fermion Index = 0.000035064
Boson Index = 0.999964936

Photoelectric:

PE_{Sphaerobismoite}=1,847.85 barns/electron
U=PE_{Sphaerobismoite} x rElectron Density=10718.01 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sphaerobismoite is Not Radioactive

Sphaerobismoite Classification

Dana Class:

04.03.13.01 (04)Simple Oxides

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

(04.03.13)Dana Group

04.03.13.01 Sphaerobismoite Bi2O3 P 4₂212 or P 4₁/n Tetra

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

Strunz Class:

04.CB.65 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.CB -With medium-sized cations

04.CB.65 Sphaerobismoite Bi2O3 P 4₂212 or P 4₁/n Tetra

Other Sphaerobismoite Information

References:

NAME( MinRec, Vol. 28, No. 3) PHYS. PROP.(Am.Min.,Vol.81,p1514,1996) OPTIC PROP.(MinRec, Vol. 28, No. 3)

See Also:

Links to other databases for Sphaerobismoite :
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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Print or Cut-and-Paste your Sphaerobismoite Specimen Label here :

Sphaerobismoite

Bi2O3
Dana No: 04.03.13.01 Strunz No: 04.CB.65
Locality:

Notes:

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