Pucherite Mineral Data

Pucherite Mineral Data +

General Pucherite Information

Chemical Formula:

BiVO4

Composition:

Molecular Weight = 323.92 gm

Vanadium 15.73 % V 28.07 % V₂O₅

Bismuth 64.52 % Bi 71.93 % Bi₂O₃

Oxygen 19.76 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Bi(VO₄)

Environment:

Alteration product of native bismuth associated with bismutite and beyerite. One of 3 BiVO4 polymorphs (clinobisvanite and dreyerite).

IMA Status:

Valid Species (Pre-IMA) 1871

Locality:

Oxidized portions of Bi-Ag-U-Ca veins in the Pucher shaft of the Wolfgang Mine, Schneeberg, Saxony, Germany. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Synonym:

ICSD 70118

PDF 12-293

Pucherite Image

Images:

Pucherite Schumacherite

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

Pucherite Crystallography

Axial Ratios:

a:b:c =1.0649:1:2.3758

Cell Dimensions:

a = 5.38, b = 5.052, c = 12.003, Z = 4; V = 326.24 Den(Calc)= 6.59

Crystal System:

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

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

By Intensity(I/I_o): 3.499(1), 2.702(1), 4.644(0.55),3.96(0.5), 1.934(0.4), 1.99(0.4), 2.13(0.4), 2.99(0.4), 2.7(0.1),

Crystal Structure:

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Qurashi M M , Barnes W H , American Mineralogist , 37 (1952) p.423-426, A preliminary structure for pucherite, BiVO4

View Additional jPOWD Structure files for Pucherite
[1] [2]

Physical Properties of Pucherite

Cleavage:

[001] Perfect

Color:

Yellow brown, Dark brown red, Pink brown, Reddish brown.

Density:

6.25

Diaphaniety:

Transparent to Opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Pulverulent - Forms a loose, poorly-coherent powdery mass.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

4 - Fluorite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Adamantine

Magnetism:

Nonmagnetic

Streak:

yellow

Optical Properties of Pucherite

Gladstone-Dale:

CI meas= -0.147 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.088 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2236,KPDmeas= 0.2357,KC= 0.2055

Optical Data:

Biaxial (-), a=2.41, b=2.5, g=2.51, bire=0.1000, 2V(Calc)=34, 2V(Meas)=19. Dispersion marked to extreme, r < v.

Pleochroism (x):

yellow brown.

Pleochroism (y):

yellow brown.

Pleochroism (z):

yellow brown.

Calculated Properties of Pucherite

Electron Density:

r_electron=5.62 gm/cc
note: r_Pucherite=6.59 gm/cc.

Fermion Index

Fermion Index = 0.00048
Boson Index = 0.99952

Photoelectric:

PE_Pucherite=1,221.91 barns/electron
U=PE_Pucherite x r_electron=6,861.17 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pucherite is Not Radioactive

Pucherite Classification

Dana Class:

38.4.6.1 (38)Anhydrous Phosphates, etc

(38.4)A+ XO4

(38.4.6)Dana Group

38.4.6.1 Pucherite BiVO4 Pnca 2/m 2/m 2/m

Strunz Class:

VII/A.19-20 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of very big size: Ca, Na and andre

VII/A.19 - Dreyerite series

VII/A.19-10 Dreyerite BiVO4 I 4₁/amd 4/m 2/m 2/m

VII/A.19-20 Pucherite BiVO4 Pnca 2/m 2/m 2/m

VII/A.19-30 Clinobisvanite BiVO4 I2/a 2/m

Other Pucherite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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Pucherite

BiVO4
Dana No: 38.4.6.1 Strunz No: VII/A.19-20
Locality:

Notes: