Sidwillite Mineral Data

General Sidwillite Information

Chemical Formula:

MoO3•2(H2O)

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

Empirical Formula:

MoO₃•2(H₂O)

Environment:

Oxidation product of jordisite in a quartz vein.

IMA Status:

Approved IMA 1985

Locality:

Lake Como, Hinsdale Co., Colorado, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Sidney Arthur Williams (1933- ), American mineralogist and petrologist of Douglas, Arizona, USA,

Name Pronunciation:

Sidwillite + Pronunciation

Synonym:

ICSD 16521

PDF 39-363

Sidwillite Image

Images:

Sidwillite

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

Axial Ratios:

a:b:c =0.768:1:0.7581

Cell Dimensions:

a = 10.618, b = 13.825, c = 10.482, Z = 16; beta = 91.61° V = 1,538.09 Den(Calc)= 3.11

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/I_o): 3.322(1), 3.248(0.93), 6.94(0.84),

Physical Properties of Sidwillite

Cleavage:

{010} Perfect

Color:

Yellow, Resin yellow, Light green.

Density:

3.12

Diaphaneity:

Transparent

Hardness:

2.5 - Finger Nail

Luster:

Resinous

Streak:

white

Optical Properties of Sidwillite

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

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

Electron Density:

Bulk Density (Electron Density)=2.98 gm/cc
note: Specific Gravity of Sidwillite =3.12 gm/cc.

Fermion Index:

Fermion Index = 0.13
Boson Index = 0.87

Photoelectric:

PE_Sidwillite= 85.40 barns/electron
U=PE_Sidwillite x rElectron Density= 254.64 barns/cc.

Radioactivity:

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

Sidwillite Classification

Dana Class:

04.05.06.01 (04)Simple Oxides

(04.05)with a cation charge of 6+ (A++++++ O3)

(04.05.06)Dana Group

04.05.06.01 Sidwillite MoO3•2(H2O) P 2₁/n 2/m

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 ï¿½ (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

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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
15 - WWW-MINCRYST

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

Sidwillite

MoO3•2(H2O)
Dana No: 04.05.06.01 Strunz No: 04.FJ.05
Locality:

Notes:

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