General Powellite Information
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Chemical Formula: |
CaMoO4 |
Composition: |
Molecular Weight = 200.02 gm |
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Calcium 20.04 % Ca 28.04 % CaO |
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Molybdenum 47.97 % Mo 71.96 % MoO3 |
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Oxygen 32.00 % O |
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______ ______ |
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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 |
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PDF 29-351 |
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Powellite Image |
Images:
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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 |
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Powellite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 3.1(1), 1.929(0.3), 4.76(0.25), |
Forms:
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Forms:
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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, 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]
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Physical Properties of Powellite
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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 |
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Optical Properties of Powellite
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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. |
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Calculated Properties of Powellite
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Electron Density: |
relectron=3.99 gm/cc note: rPowellite =4.25 gm/cc. |
Fermion Index |
Fermion Index = 0.12259 Boson Index = 0.87741 |
Photoelectric: |
PEPowellite = 80.66 barns/electron U=PEPowellite x relectron= 322.21 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Powellite is Not Radioactive |
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Powellite Classification
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Dana Class: |
48.1.2.2 (48)Anhydrous Molybdates and Tungstates |
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(48.1)where A XO4 |
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(48.1.2)Dana Group |
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48.1.2.1 Scheelite CaWO4 I 41/a 4/m |
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48.1.2.2 Powellite CaMoO4 I 41/a 4/m |
Strunz Class: |
VI/G.01-10 VI - Sulfates,Chromates,Molybdates and Tungstates |
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VI/G - Molybdates [MoO4]2- and wolframates [WO4]2- |
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VI/G.01 - Scheelite - Wulfenite series, (Powellite - Raspite) |
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VI/G.01-10 Powellite CaMoO4 I 41/a 4/m |
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VI/G.01-20 Scheelite CaWO4 I 41/a 4/m |
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VI/G.01-25 Paraniite-(Y) Ca2Y(AsO4)(WO4)2 I 41/a 4/m |
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VI/G.01-30 Wulfenite PbMoO4 I 41/a 4/m |
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VI/G.01-40 Stolzite PbWO4 I 41/a 4/m |
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VI/G.01-50 Raspite PbWO4 P 2/n 2/m |
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VI/G.01-60 Koechlinite Bi2MoO6 C mca 2/m 2/m 2/m |
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VI/G.01-70 Russellite Bi2WO6 P ca21 mm2 |
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Other Powellite Information
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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 - Crocoite.com Mineral Locations
5 - EUROmin Project
6 -Google Images
7 -Google Scholar
8 -Handbook of Mineralogy (UofA)
9 - HyperPhysics
10 -MinDAT
11 -MinMax(Deutsch)
12 -MinMax(English)
13 -Mineralienatlas (Deutsch)
14 -QUT Mineral Atlas
15 -University of Colorado - Mineral Structure Data
16 - WWW-MINCRYST
17 -École des Mines de Paris
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Powellite
CaMoO4
Dana No: 48.1.2.2 Strunz No: VI/G.01-10
Locality:
Notes:
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