Vauquelinite Mineral Data

Vauquelinite Mineral Data +

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General Vauquelinite Information

Chemical Formula:

Pb2Cu(CrO4)(PO4)(OH)

Composition:

Molecular Weight = 705.92 gm

Chromium 7.37 % Cr 14.17 % CrO₃

Copper 9.00 % Cu 11.27 % CuO

Phosphorus 4.39 % P 10.05 % P₂O₅

Hydrogen 0.14 % H 1.28 % H₂O

Lead 58.70 % Pb 63.24 % PbO

Oxygen 20.40 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₂Cu(CrO₄)(PO₄)(OH)

IMA Status:

Valid Species (Pre-IMA) 1818

Locality:

Beresov, Ural Mountains, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Louis N. Vauquelin (1763-1829), French chemist and discoverer of chromium.

Synonym:

ICSD 26815

PDF 13-302

Vauquelinite Image

Images:

Click Here for Larger Vauquelinite Image

Vauquelinite Crocoite

Comments: Olive-greenish vauquelinite encrusting red crocoite.
Location: Callenberg North (no. 1) open cut, Callenberg, Glauchau, Saxony, Germany. Scale: Picture size 6 mm.
© Thomas Witzke / Abraxas-Verlag

Vauquelinite Crystallography

Axial Ratios:

a:b:c =2.3689:1:1.647

Cell Dimensions:

a = 13.754, b = 5.806, c = 9.563, Z = 4; beta = 94.57° V = 761.23 Den(Calc)= 6.16

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 3.293(1), 4.726(0.57), 2.894(0.51),

Forms:

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Crystal Structure:

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Fanfani L , Zanazzi P F , Zeitschrift fur Kristallographie , 126 (1968) p.433-443, The crystal structure of vauquelinite and the relationships to fornacite, Locality: Beresov, Ural Mountains, Russia

Physical Properties of Vauquelinite

Cleavage:

[???] Indistinct

Color:

Brown, Brownish green, Brownish black, Green, Black.

Density:

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Mammillary - Larger "breast-like" rounded forms resembling botryoidal (e.g. malachite).

Habit:

Reniform - "Kidney like" in shape (e.g.. hematite).

Hardness:

2.5-3 - Finger Nail-Calcite

Luminescence:

Non-fluorescent.

Luster:

Adamantine - Resinous

Magnetism:

Nonmagnetic

Streak:

brownish

Optical Properties of Vauquelinite

Gladstone-Dale:

CI meas= -0.137 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.108 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1921,KPDmeas= 0.1972,KC= 0.1735

Optical Data:

Biaxial (-), a=2.11, b=2.22, g=2.22, bire=0.1100

Pleochroism (x):

pale green.

Pleochroism (y):

pale brown.

Pleochroism (z):

pale brown.

Calculated Properties of Vauquelinite

Electron Density:

r_electron=5.32 gm/cc
note: r_Vauquelinite=6.16 gm/cc.

Fermion Index

Fermion Index = 0.13683
Boson Index = 0.86317

Photoelectric:

PE_Vauquelinite=1,049.35 barns/electron
U=PE_Vauquelinite x r_electron=5,585.68 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Vauquelinite is Not Radioactive

Vauquelinite Classification

Dana Class:

43.4.3.1 (43)Compound Phosphates, etc.

(43.4)(Anhydrous Compound Anions With Hydroxyl or Halogen)

(43.4.3)Brackebushite Group

43.4.3.1 Vauquelinite Pb2Cu(CrO4)(PO4)(OH) P 2₁/n 2/m

43.4.3.2 Fornacite Pb2Cu(CrO4)(AsO4)(OH) P 2₁/c 2/m

43.4.3.3 Molybdofornacite Pb2Cu[(As,P)O4][(Mo,Cr)O4](OH) P 2₁/c 2/m

Strunz Class:

VI/F.02-10 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/F - Chromates [CrO4]2-

VI/F.02 - Wattersite - Satanaite series

VI/F.02-03 Wattersite Hg4HgCrO6 C 2/c 2/m

VI/F.02-05 Edoylerite Hg3CrO4S2 P 2₁/a 2/m

VI/F.02-07 Deanesmithite Hg2Hg3CrO5S2 P1 1

VI/F.02-10 Vauquelinite Pb2Cu(CrO4)(PO4)(OH) P 2₁/n 2/m

VI/F.02-20 Fornacite Pb2Cu(CrO4)(AsO4)(OH) P 2₁/c 2/m

VI/F.02-30 Molybdofornacite Pb2Cu[(As,P)O4][(Mo,Cr)O4](OH) P 2₁/c 2/m

VI/F.02-40 Phoenicochroite Pb2(CrO4)O C 2/m 2/m

VI/F.02-50 Santanaite Pb9Pb2CrO16 P 6₃22 6 2 2

Other Vauquelinite Information

References:

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

See Also:

Links to other databases for Vauquelinite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Vauquelinite

Pb2Cu(CrO4)(PO4)(OH)
Dana No: 43.4.3.1 Strunz No: VI/F.02-10
Locality:

Notes: