Powellite Mineral Data

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General Powellite Information

Chemical Formula:

CaMoO4

Composition:

Molecular Weight = 200.02 gm

Calcium 20.04 % Ca 28.04 % CaO

Molybdenum 47.97 % Mo 71.96 % MoO₃

Oxygen 32.00 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaMoO₄

IMA Status:

Valid Species (Pre-IMA) 1891

Locality:

Peacock Mine, Cuprum, Seven Devils District, Adams Co., Idaho, USA Link to MinDat.org Location Data.

Name Origin:

Named after the American geologist, John Westly Powell (1834-1902).

Synonym:

ICSD 60552

PDF 29-351

Powellite Image

Images:

Powellite

Comments: Sharp, thumbnail-sized crystal group of yellowish brown lustrous powellite crystals, the largest measuring 15 x 18 mm in size.
Location: Pandulane quarry, Nasik district, Maharashtra, India. Scale: 20 x 25 x 16 mm.
© Dan Weinrich

Powellite Crystallography

Axial Ratios:

a:c = 1:2.18738

Cell Dimensions:

a = 5.23, c = 11.44, Z = 4; V = 312.92 Den(Calc)= 4.25

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), 1.929(0.3), 4.76(0.25),

Forms:

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Forms: [ 1 1 2] [ 0 0 1]

Warning: this large pop-up is very compute intensive and may not work well with some computers.

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, Note: B(2,2) altered from .0012 in order to match Biso

View Additional jPOWD Structure files for Powellite
[1] [2] [3] [4] [5] [6]

Physical Properties of Powellite

Cleavage:

[111] Distinct

Color:

Blue, Brown, Green yellow, Greenish blue, Gray.

Density:

4.34

Diaphaniety:

Transparent

Fracture:

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

Habit:

Crystalline - Coarse - Occurs as well-formed coarse sized crystals.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

3.5 - Copper Penny

Luminescence:

None.

Luster:

Adamantine - Resinous

Magnetism:

Nonmagnetic

Streak:

light yellow

Optical Properties of Powellite

Dichroism (e):

none.

Dichroism (w):

none.

Gladstone-Dale:

CI meas= 0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2304,KPDmeas= 0.2256,KC= 0.2294

Optical Data:

Uniaxial (+), w=1.974, e=1.984, bire=0.0100.

Calculated Properties of Powellite

Electron Density:

r_electron=3.99 gm/cc
note: r_Powellite=4.25 gm/cc.

Fermion Index

Fermion Index = 0.12259
Boson Index = 0.87741

Photoelectric:

PE_Powellite= 80.66 barns/electron
U=PE_Powellite x r_electron= 322.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Powellite is Not Radioactive

Powellite Classification

Dana Class:

48.1.2.2 (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.01-10 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 Powellite Information

References:

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

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Powellite

CaMoO4
Dana No: 48.1.2.2 Strunz No: VI/G.01-10
Locality:

Notes: