Mineralogy Database

Sidwillite Mineral Data

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General Sidwillite Information

Help on Chemical  Formula: Chemical Formula: MoO3•2(H2O)
Help on Composition: Composition: Molecular Weight = 179.97 gm
   Molybdenum  53.31 %  Mo   79.98 % MoO3
   Hydrogen     2.24 %  H    20.02 % H2O
   Oxygen      44.45 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: MoO3•2(H2O)
Help on Environment: Environment: Oxidation product of jordisite in a quartz vein.
Help on IMA Status: IMA Status: Approved IMA 1985
Help on Locality: Locality: Lake Como, Hinsdale Co., Colorado, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Sidney Arthur Williams (1933- ), American mineralogist and petrologist of Douglas, Arizona, USA,
Help on Name Pronunciation: Name Pronunciation: Sidwillite + Pronunciation Say SIDWILLITE
Help on Synonym: Synonym: ICSD 16521
  PDF 39-363

Sidwillite Image

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Comments: Thin olive-green sidwillite coatings on quartz crystals.
Location: Lake Como, Summit County, Colorado, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Sidwillite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.768:1:0.7581
Help on Cell Dimensions: Cell Dimensions: a = 10.618, b = 13.825, c = 10.482, Z = 16; beta = 91.61° V = 1,538.09 Den(Calc)= 3.11
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.322(1), 3.248(0.93), 6.94(0.84),

Physical Properties of Sidwillite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Yellow, Resin yellow, Light green.
Help on Density: Density: 3.12
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Resinous
Help on Streak: Streak: white

Optical Properties of Sidwillite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.364 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.369 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3526,KPDmeas= 0.3515,KC= 0.2576
Ncalc = 1.8
Help on Optical Data: Optical Data: Biaxial (-), a=1.7, b=2.21, g=2.38, bire=0.6800, 2V(Calc)=48, 2V(Meas)=48.

Calculated Properties of Sidwillite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.98 gm/cc
note: Specific Gravity of Sidwillite =3.12 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.13
Boson Index = 0.87
Help on Photoelectric: Photoelectric: PESidwillite = 85.40 barns/electron
U=PESidwillite x rElectron Density= 254.64 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sidwillite is Not Radioactive

Sidwillite Classification

Help on  Dana Class: Dana Class: (04)Simple Oxides
  (04.05)with a cation charge of 6+ (A++++++ O3)
  (04.05.06)Dana Group Sidwillite MoO3•2(H2O) P 21/n 2/m
Help on  Strunz Class: Strunz Class: 04.FJ.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.F - Hydroxides (without V or U)
  04.FJ -Hydroxides with H2O � (OH); corner-sharing octahedra
04.FJ.05 Meymacite WO3•2(H2O) None
04.FJ.05 Sidwillite MoO3•2(H2O) P 21/n 2/m

Other Sidwillite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Sidwillite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 04.FJ.05





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