Scheelite Mineral Data

Scheelite Mineral Data +

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General Scheelite Information

Chemical Formula:

CaWO4

Composition:

Molecular Weight = 287.93 gm

Calcium 13.92 % Ca 19.48 % CaO

Tungsten 63.85 % W 80.52 % WO₃

Oxygen 22.23 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca(WO₄)

IMA Status:

Valid Species (Pre-IMA) 1821

Locality:

Bispberg iron mine, Säter, Dalarna, Sweden Link to MinDat.org Location Data.

Name Origin:

Named after the Swedish chemist, Karl Wilhelm Scheele (1742-1786).

Synonym:

Calcium Tungstate

ICSD 60547

PDF 41-1431

Scheelite Image

Images:

Scheelite

Comments: Orange scheelite with white mica.
Location: Pingwu, Sichuan, China. Scale: 9.5 x 9 cm.
© Fabre Minerals

Scheelite Crystallography

Axial Ratios:

a:c = 1:2.1694

Cell Dimensions:

a = 5.242, c = 11.372, Z = 4; V = 312.49 Den(Calc)= 6.12

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): 3.1(1), 4.76(0.55), 3.072(0.3),

Forms:

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Forms: [ 1 0 3] [ 1 0 1]

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Crystal Structure:

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Hazen R M , Finger L W , Mariathasan J W E , Journal of Physics and Chemistry of Solids , 46 (1985) p.253-263, High-pressure crystal chemistry of scheelite-type tungstates and molybdates, Note: P = 0.0001 GPa, in air

View Additional jPOWD Structure files for Scheelite
[1] [2] [3] [4] [5]

Physical Properties of Scheelite

Cleavage:

[010] Distinct

Color:

Colorless, White, Pale yellow, Brownish yellow, Reddish yellow.

Density:

5.9 - 6.12, Average = 6.01

Diaphaniety:

Transparent to translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Columnar - Forms columns

Habit:

Disseminated - Occurs in small, distinct particles dispersed in matrix.

Habit:

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

Hardness:

4-5 - Fluorite-Apatite

Luminescence:

Fluorescent, Short UV=bright bluish white.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Scheelite

Gladstone-Dale:

CI meas= 0.136 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.152 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1515,KPDmeas= 0.1543,KC= 0.1786

Optical Data:

Uniaxial (+), w=1.918-1.92, e=1.934-1.937, bire=0.0160-0.0170.

Calculated Properties of Scheelite

Electron Density:

r_electron=5.26 gm/cc
note: r_Scheelite=6.01 gm/cc.

Fermion Index

Fermion Index = 0.09147
Boson Index = 0.90853

Photoelectric:

PE_Scheelite= 789.14 barns/electron
U=PE_Scheelite x r_electron=4,150.96 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Scheelite is Not Radioactive

Scheelite Classification

Dana Class:

48.1.2.1 (48)Anhydrous Molybdates and Tungstates

(48.1)where A XO4

(48.1.2)Dana Group

48.1.2.1 Scheelite CaWO4 I 4₁/a 4/m

48.1.2.2 Powellite CaMoO4 I 4₁/a 4/m

Strunz Class:

VI/G.01-20 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 Scheelite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Mason68)

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Scheelite

CaWO4
Dana No: 48.1.2.1 Strunz No: VI/G.01-20
Locality:

Notes: