Wulfenite Mineral Data

Wulfenite Mineral Data +

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General Wulfenite Information

Chemical Formula:

PbMoO4

Composition:

Molecular Weight = 367.14 gm

Molybdenum 26.13 % Mo 39.21 % MoO₃

Lead 56.44 % Pb 65.15 % PbO₂

Oxygen 17.43 % O

______ ______

100.00 % 104.36 % = TOTAL OXIDE

Empirical Formula:

Pb(MoO₄)

Environment:

Secondary lead mineral. Forms a series with stolzite.

IMA Status:

Valid Species (Pre-IMA) 1845

Locality:

Bleiberg, Villach, Kärnten (Carinthia), Austria Link to MinDat.org Location Data.

Name Origin:

Named after the Austrian mineralogist, Frantz Xaver von Wulfen (1728-1805).

Synonym:

ICSD 26784

PDF 44-1486

Yellow Lead Ore

Wulfenite Image

Images:

Wulfenite

Comments: Tabular crystal druse of brownish orange wulfenite on matrix.
Location: Ahumada mine, Los Lamentos, Chihuahua, Mexico. Scale: Crystal size 5-10 mm.
© Dave Barthelmy

Images:

Wulfenite Mimetite

Comments: Gemmy, pale yellow mimetite crystal with brownish-orange wulfenite. Former James and Dawn Minette Collection.
Location: Gem Pocket 1971, Tsumeb, Namibia. Scale: 2 x 1 x 1 cm.
© Rob Lavinsky

Wulfenite Crystallography

Axial Ratios:

a:c = 1:2.22815

Cell Dimensions:

a = 5.435, c = 12.11, Z = 4; V = 357.72 Den(Calc)= 6.82

Crystal System:

Tetragonal - DipyramidalH-M Symbol (4/m) Space Group: I 4₁/a

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

By Intensity(I/I_o): 3.24(1), 2.021(0.3), 1.653(0.25),

Forms:

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Crystal Structure:

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Leciejewicz J , Zeitschrift fur Kristallographie , 121 (1965) p.158-164, A neutron crystallographic investigation of lead molybdenum oxide, PbMoO4, Locality: Los Lamentos, Mexico

View Additional jPOWD Structure files for Wulfenite
[1]

Physical Properties of Wulfenite

Cleavage:

[101] Imperfect

Color:

Orange yellow, Waxy yellow, Yellowish gray, Olive green, Brown.

Density:

6.5 - 7, Average = 6.75

Diaphaniety:

Subtransparent to subtranslucent

Fracture:

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

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3 - Calcite

Luminescence:

None.

Luster:

Resinous - Greasy

Streak:

yellowish white

Optical Properties of Wulfenite

Gladstone-Dale:

CI meas= -0.242 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.23 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1984,KPDmeas= 0.2004,KC= 0.1613

Optical Data:

Uniaxial (-), e=2.304, w=2.402, bire=0.0980.

Calculated Properties of Wulfenite

Electron Density:

r_electron=5.80 gm/cc
note: r_Wulfenite=6.82 gm/cc.

Fermion Index

Fermion Index = 0.19136
Boson Index = 0.80864

Photoelectric:

PE_Wulfenite=1,066.49 barns/electron
U=PE_Wulfenite x r_electron=6,181.11 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Wulfenite is Not Radioactive

Wulfenite Classification

Dana Class:

48.1.3.1 (48)Anhydrous Molybdates and Tungstates

(48.1)where A XO4

(48.1.3)Dana Group

48.1.3.1 Wulfenite PbMoO4 I 4₁/a 4/m

48.1.3.2 Stolzite PbWO4 I 4₁/a 4/m

Strunz Class:

VI/G.01-30 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/G - Molybdates [MoO4]2- and wolframates [WO4]2-

VI/G.01 - Scheelite - Wulfenite series, (Powellite - Raspite)

VI/G.01-10 Powellite CaMoO4 I 4₁/a 4/m

VI/G.01-20 Scheelite CaWO4 I 4₁/a 4/m

VI/G.01-25 Paraniite-(Y) Ca2Y(AsO4)(WO4)2 I 4₁/a 4/m

VI/G.01-30 Wulfenite PbMoO4 I 4₁/a 4/m

VI/G.01-40 Stolzite PbWO4 I 4₁/a 4/m

VI/G.01-50 Raspite PbWO4 P 2/n 2/m

VI/G.01-60 Koechlinite Bi2MoO6 C mca 2/m 2/m 2/m

VI/G.01-70 Russellite Bi2WO6 P ca2₁ mm2

Other Wulfenite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Wulfenite

PbMoO4
Dana No: 48.1.3.1 Strunz No: VI/G.01-30
Locality:

Notes: