Sphaerobismoite Mineral Data

Sphaerobismoite Mineral Data +

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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.

Synonym:

IMA1993-009

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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:

TetragonalSpace 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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Sphaerobismoite

Electron Density:

r_electron=5.80 gm/cc
note: r_{Sphaerobismoite}=7.17 gm/cc.

Fermion Index

Fermion Index = 0.00003
Boson Index = 0.99997

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Sphaerobismoite is Not Radioactive

Sphaerobismoite Classification

Dana Class:

4.3.13.1 (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.02-35 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 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 -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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Print or Cut-and-Paste your Sphaerobismoite Specimen Label here :

Sphaerobismoite

Bi2O3
Dana No: 4.3.13.1 Strunz No: IV/C.02-35
Locality:

Notes: