Schumacherite Mineral Data

Schumacherite Mineral Data +

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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

Schumacherite Image

Images:

Click Here for Larger Schumacherite Image

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 - PinacoidalH-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= -0.041 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.186,KPDmeas= 0.1855,KC= 0.1787

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:

r_electron=5.83 gm/cc
note: r_{Schumacherite}=6.90 gm/cc.

Fermion Index

Fermion Index = 0.00025
Boson Index = 0.99975

Photoelectric:

PE_{Schumacherite}=1,331.50 barns/electron
U=PE_{Schumacherite} x r_electron=7,764.46 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Schumacherite is Not Radioactive

Schumacherite Classification

Dana Class:

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

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

(41.10.9)Dana Group

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

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

Strunz Class:

VII/B.30-20 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.30 - Petitjeanite - Kuznetsovite series

VII/B.30-01 Smrkovecite! Bi2O(OH)(PO4) P 2₁/c 2/m

VII/B.30-02 Atelestite Bi8(AsO4)3(OH)5O5 P 2₁/a 2/m

VII/B.30-03 Hechtsbergite! Bi2O(OH)(VO4) P 2₁/c 2/m

VII/B.30-05 Petitjeanite Bi3(PO4)2O(OH) P1 1

VII/B.30-10 Preisingerite Bi3(AsO4)2O(OH) P1 1

VII/B.30-20 Schumacherite Bi3[(V,As,P)O4]2O(OH) P1 1

VII/B.30-30 Kuznetsovite! Hg3Cl(AsO4) P 2₁3 2 3

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 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Schumacherite

Bi3[(V,As,P)O4]2O(OH)
Dana No: 41.10.9.2 Strunz No: VII/B.30-20
Locality:

Notes: