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General Powellite Information

Help on Chemical  Formula: Chemical Formula: CaMoO4
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: CaMoO4
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1891
Help on Locality: Locality: Peacock Mine, Cuprum, Seven Devils District, Adams Co., Idaho, USA Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the American geologist, John Westly Powell (1834-1902).
Help on Name Pronunciation: Name Pronunciation: Powellite + Pronunciation Say POWELLITE
Help on Synonym: Synonym: ICSD 60552
  PDF 29-351
 

Powellite Image

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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

Powellite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.18738
Help on Cell Dimensions: Cell Dimensions: a = 5.23, c = 11.44, Z = 4; V = 312.92 Den(Calc)= 4.25
Help on Crystal System: 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/Io): 3.1(1), 1.929(0.3), 4.76(0.25),
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 1 2) ( 0 0 1)

Warning: this java applet does not work in some browsers because of security restrictions.

 

Physical Properties of Powellite

Help on Cleavage: Cleavage: {111} Distinct
Help on Color: Color: Blue, Brown, Green yellow, Greenish blue, Gray.
Help on Density: Density: 4.34
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luminescence: Luminescence: Fluorescent, Short UV=yellow-white to golden yellow, Long UV=Yellow-white to golden yellow.
Help on Luster: Luster: Adamantine - Resinous
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: light yellow
 

Optical Properties of Powellite

Help on Dichroism (e): Dichroism (e): none.
Help on Dichroism (w): Dichroism (w): none.
Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (+), w=1.974, e=1.984, bire=0.0100.
 

Calculated Properties of Powellite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.99 gm/cc
note: Specific Gravity of Powellite =4.25 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.12
Boson Index = 0.88
Help on Photoelectric: Photoelectric: PEPowellite = 80.66 barns/electron
U=PEPowellite x rElectron Density= 322.21 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Powellite is Not Radioactive
 

Powellite Classification

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: 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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