Schumacherite Mineral Data

General Schumacherite Information

Chemical Formula:

Bi3[(V,As,P)O4]2O(OH)

Composition:

Molecular Weight = 900.22 gm

Vanadium 6.79 % V 12.12 % V₂O₅

Bismuth 69.64 % Bi 77.64 % Bi₂O₃

Arsenic 4.99 % As 7.66 % As₂O₅

Phosphorus 0.69 % P 1.58 % P₂O₅

Hydrogen 0.11 % H 1.00 % H₂O

Oxygen 17.77 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Bi₃(VO₄)_1.2(AsO₄)_0.6(PO₄)_0.2O(OH)

Environment:

Probable series with preisingerite.

IMA Status:

Approved IMA 1983

Locality:

Schneeberg, Germany Link to MinDat.org Location Data.

Name Origin:

Named for Friedrich Schumacher, professor, University of Freiberg and Bonn, Germany

Name Pronunciation:

Schumacherite + Pronunciation

Schumacherite Image

Images:

Schumacherite Pucherite

Comments: Brown crystals of pucherite with yellow schumacherite on matrix.
Location: Pucher Shaft, Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Schumacherite Crystallography

Axial Ratios:

a:b:c =1.3471:1:0.9249

Cell Dimensions:

a = 10.05, b = 7.46, c = 6.9, Z = 2; alpha = 87.7°, beta = 115.3°, gamma = 111.5° V = 434.80 Den(Calc)= 6.88

Crystal System:

Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 3.28(1), 3.09(0.8), 3.19(0.8),

Physical Properties of Schumacherite

Cleavage:

None

Color:

Yellow, Yellow brown.

Density:

6.9

Fracture:

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

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3 - Calcite

Luster:

Adamantine

Streak:

light yellow

Optical Properties of Schumacherite

Gladstone-Dale:

CI meas= -0.038 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.032 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1844,KPDmeas= 0.1855,KC= 0.1787
Ncalc = 2.23 - 2.24

Optical Data:

Biaxial (+), a=2.2, g=2.3-2.42, bire=0.1000-0.2200, 2V(Meas)=~90.

Calculated Properties of Schumacherite

Electron Density:

Bulk Density (Electron Density)=5.87 gm/cc
note: Specific Gravity of Schumacherite =6.94 gm/cc.

Fermion Index:

Fermion Index = 0.000255937
Boson Index = 0.999744063

Photoelectric:

PE_{Schumacherite}=1,331.50 barns/electron
U=PE_{Schumacherite} x rElectron Density=7,809.47 barns/cc.

Radioactivity:

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

Schumacherite Classification

Dana Class:

41.10.09.02 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.10)where (A++ B++)3 (XO4)2 Zq

(41.10.09)Preisingerite Group

41.10.09.01 Preisingerite Bi3(AsO4)2O(OH) P1 1

41.10.09.02 Schumacherite Bi3[(V,As,P)O4]2O(OH) P1 1

Strunz Class:

08.BO.10 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.10 Preisingerite Bi3(AsO4)2O(OH) P1 1

08.BO.10 Petitjeanite Bi3(PO4)2O(OH) P1 1

08.BO.10 Schumacherite Bi3[(V,As,P)O4]2O(OH) P1 1

Other Schumacherite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Schumacherite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Schumacherite

Bi3[(V,As,P)O4]2O(OH)
Dana No: 41.10.09.02 Strunz No: 08.BO.10
Locality:

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