Schlegelite Mineral Data

General Schlegelite Information

Chemical Formula:

Bi7O4(MoO4)2(AsO4)3

Composition:

Molecular Weight = 2,227.18 gm

Calcium 0.04 % Ca 0.05 % CaO

Vanadium 0.11 % V 0.20 % V₂O₅

Bismuth 63.62 % Bi 70.92 % Bi₂O₃

Molybdenum 8.18 % Mo 12.28 % MoO₃

Arsenic 10.13 % As 15.53 % As₂O₅

Phosphorus 0.22 % P 0.51 % P₂O₅

Lead 0.47 % Pb 0.50 % PbO

Oxygen 17.23 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Bi_6.78Pb_0.05Ca_0.02O_3.51(MoO₄)_1.9(PO₄)_0.16(VO₄)_0.05(AsO₄)_3.01

Environment:

Secondary mineral formed from oxidation of primary sulfide ores.

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Mine dumps of the Pucher Shaft, Schneeberg District, Erzgebirge, Saxony, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for Fritz Schlegel, a dedicated mineral collector.

Synonym:

IMA2003-051

Schlegelite Crystallography

Axial Ratios:

a:b:c =0.3284:1:1.4844

Cell Dimensions:

a = 5.299, b = 16.133, c = 23.948, Z = 4; V = 2,047.28 Den(Calc)= 7.23

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnca

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

By Intensity(I/I_o): 2.688(1), 2.996(0.69), 2.963(0.48),3.41(0.37), 2.001(0.28), 1.657(0.14), 1.887(0.13),

Physical Properties of Schlegelite

Color:

Yellow.

Diaphaneity:

Transparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

3.5 - Copper Penny

Luster:

Adamantine

Streak:

pale yellow

Optical Properties of Schlegelite

Gladstone-Dale:

CI calc= -0.043 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1722,KC= 0.1652
Ncalc = 2.19

Optical Data:

Biaxial (-), a=2.22, b=2.255, g=2.26, bire=0.0400, 2V(Calc)=40, 2V(Meas)=42. Dispersion Calculated index values.

Calculated Properties of Schlegelite

Electron Density:

Bulk Density (Electron Density)=6.11 gm/cc
note: Specific Gravity of Schlegelite =7.23 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Schlegelite=1,241.54 barns/electron
U=PE_Schlegelite x rElectron Density=7,591.91 barns/cc.

Radioactivity:

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

Schlegelite Classification

Dana Class:

48.04.03.02 (48)Anhydrous Molybdates and Tungstates

(48.04)with miscellaneous formulae

(48.04.03)Vergasovaite Series

48.04.03.01 Vergasovaite! Cu3O[(Mo,S)O4][SO4] P nma 2/m 2/m 2/m

48.04.03.02 Schlegelite! Bi7O4(MoO4)2(AsO4)3 Pnca 2/m 2/m 2/m

Strunz Class:

08.BO.45 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BO -With only large cations, (OH, etc.):RO4 ï¿½ 1:1

08.BO.45 Schlegelite! Bi7O4(MoO4)2(AsO4)3 Pnca 2/m 2/m 2/m

Other Schlegelite Information

References:

NAME( EurJMin, v18:803) PHYS. PROP.(EurJMin, v18:803) OPTIC PROP.(EurJMin, v18:803)

See Also:

Links to other databases for Schlegelite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Schlegelite Specimen Label here :

Schlegelite

Bi7O4(MoO4)2(AsO4)3
Dana No: 48.04.03.02 Strunz No: 08.BO.45
Locality:

Notes:

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