Mindat Logo
Home Page Log In Message Board The Mindat Directory
Register Search Pages Mineral Chatroom The Mindat Store

Sidwillite

This page is currently not sponsored. Click here to sponsor this page.
Big Photo

Freedom No. 2 Mine, Marysvale District (Marysvale Uranium area), Piute Co., Utah, USA
© Brent Thorne

Show Sidwillite Photos (6)



Formula:
MoO
 
3
 · 2H
 
2
O
System:MonoclinicColour:Canary-yellow
Hardness:2½
Name:Named after Dr. Sidney A. Williams, mineralogist, Phelps Dodge Corporation, Douglas, Arizona, USA.
This page provides mineralogical data about Sidwillite.

Classification of Sidwillite

IMA status:Approved 1983
Strunz 8th edition ID:4/E.03-20
Nickel-Strunz 10th (pending) edition ID:4.FJ.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
J : Hydroxides with H2O +- (OH); corner-sharing octahedra
Dana 8th edition ID:4.5.6.1

4 : SIMPLE OXIDES
5 : AX3
Hey's CIM Ref.:7.15.3

7 : Oxides and Hydroxides
15 : Oxides of Mo and W
mindat.org URL:http://www.mindat.org/min-3654.html
Please feel free to link to this page.

Type Occurrence of Sidwillite

Type Locality:Lake Como, San Juan Co., Colorado, USA
Year of Discovery:1985

Physical Properties of Sidwillite

Lustre:Adamantine, Waxy
Colour:Canary-yellow
Hardness (Mohs):2½

Crystallography of Sidwillite

Crystal System:Monoclinic
Cell Parameters:a = 10.61Å, b = 13.82Å, c = 10.48Å
β = 91.61°
Ratio:a:b:c = 0.768 : 1 : 0.758
Unit Cell Volume:V 1,536.08 ų (Calculated from Unit Cell)

Optical Data of Sidwillite

Type:Biaxial (-)
RI values: nα = 1.700 nβ = 2.210 nγ = 2.380
2V:Measured: 48° , Calculated: 48°
Maximum Birefringence:δ = 0.680

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:relatively weak

Chemical Properties of Sidwillite

Formula:
MoO
 
3
 · 2H
 
2
O
Essential elements:H, Mo, O
All elements listed in formula:H, Mo, O

Relationship of Sidwillite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.FJ.05Meymacite
WO
 
3
 · 2H
 
2
O
4.FJ.10Tungstite
WO
 
3
 · H
 
2
O
4.FJ.15Hydrotungstite
WO
 
3
 · 2H
 
2
O
4.FJ.15Ilsemannite
Mo
 
3
O
 
8
 · nH
 
2
O
4.FJ.20Parabariomicrolite
BaTa
 
4
O
 
10
(OH)
 
2
 · 2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
7.15.1Tugarinovite
MoO
 
2
7.15.2Molybdite
MoO
 
3
7.15.4Ilsemannite
Mo
 
3
O
 
8
 · nH
 
2
O
7.15.5Tungstite
WO
 
3
 · H
 
2
O
7.15.6Hydrotungstite
WO
 
3
 · 2H
 
2
O
7.15.7Meymacite
WO
 
3
 · 2H
 
2
O
7.15.8Alumotungstite
7.15.9Jixianite
Pb(W,Fe
3+
 
)
 
2
(O,OH)
 
7

Other Names for Sidwillite

Synonyms:
IMA1983-089
Other Languages:
German:Sidwillit
Russian:Сидвиллит
Simplified Chinese:黄钼矿
Spanish:Sidwillita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Sidwillite

Reference List:

- +
Bulletin de la Société française de Minéralogie et de Cristallographie (1985): 108: 813-823.

American Mineralogist (1986): 71: 1546.

Internet Links for Sidwillite

Search Engines:
  • Look for Sidwillite on Google
  • Look for Sidwillite images on Google
    • External Links:
  • Look for Sidwillite on Webmineral
  • Look for Sidwillite on Athena Mineralogy
  • Look for Sidwillite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Sidwillite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
  • Pricedownminerals.com - Reverse Auctions and Shop
  • Search for Sidwillite from all mineral dealers at minfind.com
  • By minerals from YourMineralCollection
  • Buy from David K Joyce minerals
  • Fabre Minerals - search for Sidwillite specimens
  • Wilensky Fine Minerals
  • SpiriferMinerals.com - high quality low prices
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Top quality minerals from Kristalle of California
  • Rare and Unusual minerals at Mineralogical Research Company
  • Buy RARE Minerals from Rocks of Africa
    • Jobs:
  • Mining & Geology Jobs

    • Localities for Sidwillite

    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    USA
     
    • Colorado
      • San Juan Co.
    		"Minerals of Colorado, updated & revised", p. 437, by Eckel, Edwin B., 1997
    • Utah
      • Piute Co.
        • Marysvale District (Marysvale Uranium area)
    		Collected by and in the collection of Brent Thorne. SEM EDS and XRD analyzed by Andy Roberts.
    Mineral and/or Locality
    Search Google
     
    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
    Current server date and time: 5th Nov 2011 12:50:18
    Mineral and Locality Search
    Mineral:
    and/or Locality:
    Options
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds