Powellite Mineral Data

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).

Name Pronunciation:

Powellite + Pronunciation

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 - Dipyramidal H-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)

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Physical Properties of Powellite

Cleavage:

{111} Distinct

Color:

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

Density:

4.34

Diaphaneity:

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:

Fluorescent, Short UV=yellow-white to golden yellow, Long UV=Yellow-white to golden yellow.

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
Ncalc = 1.98 - 2

Optical Data:

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

Calculated Properties of Powellite

Electron Density:

Bulk Density (Electron Density)=3.99 gm/cc
note: Specific Gravity of Powellite =4.25 gm/cc.

Fermion Index:

Fermion Index = 0.12
Boson Index = 0.88

Photoelectric:

PE_Powellite= 80.66 barns/electron
U=PE_Powellite x rElectron Density= 322.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Powellite is Not Radioactive

Powellite Classification

Dana Class:

48.01.02.02 (48)Anhydrous Molybdates and Tungstates

(48.01)where A XO4

(48.01.02)Scheelite Series

48.01.02.01 Scheelite CaWO4 I 4₁/a 4/m

48.01.02.02 Powellite CaMoO4 I 4₁/a 4/m

Strunz Class:

07.GA.05 07 - SULFATES (SELENATES, TELLURATES)

07.G - Molybdates, Wolframates and Niobates

07.GA -Without additional anions or H2O

07.GA.05 Fergusonite-(Ce)* (Ce,La,Y)NbO4 I 4₁/a 4/m

07.GA.05 Fergusonite-(Nd)* (Nd,Ce)(Nb,Ti)O4 I 4₁/a 4/m

07.GA.05 Fergusonite-(Y) YNbO4 I 4₁/a 4/m

07.GA.05 Stolzite PbWO4 I 4₁/a 4/m

07.GA.05 Scheelite CaWO4 I 4₁/a 4/m

07.GA.05 Powellite CaMoO4 I 4₁/a 4/m

07.GA.05 Wulfenite PbMoO4 I 4₁/a 4/m

Other Powellite Information

References:

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

See Also:

Links to other databases for Powellite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - HyperPhysics
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - University of Colorado - Mineral Structure Data
18 - WWW-MINCRYST

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Print or Cut-and-Paste your Powellite Specimen Label here :

Powellite

CaMoO4
Dana No: 48.01.02.02 Strunz No: 07.GA.05
Locality:

Notes:

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