Sidwillite
A valid IMA mineral species
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About Sidwillite
Formula:
MoO3 · 2H2O
Colour:
Canary-yellow
Lustre:
Resinous
Hardness:
2½
Specific Gravity:
3.12
Crystal System:
Monoclinic
Name:
Named in 1985 by Fabian Cesbron and Daria Ginderow in honor of Sidney Arthur Williams [December 26, 1933 Ann Arbor, Michigan, USA - December 8, 2006 Douglas, Arizona, USA], mineralogist, Phelps Dodge Corporation, Douglas, Arizona, USA. Sid Williams had a profound interest in systematic mineralogy and systematic language. His choice of using native languages of the region from where he named a mineral is unmatched in mineralogy.
Type Locality:
Higher-hydrate counterpart of raydemarkite (monohydrate), tianhuixinite (1/3-hydrate), and molybdite (anhydrous).
Unique Identifiers
Mindat ID:
3654
Long-form identifier:
mindat:1:1:3654:8
GUID
(UUID V4):
(UUID V4):
4ca8819b-bbb4-4923-9b55-c4aed390db73
IMA Classification of Sidwillite
Approved
Approval year:
1983
First published:
1985
Classification of Sidwillite
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
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
4.5.6.1
4 : SIMPLE OXIDES
5 : AX3
4 : SIMPLE OXIDES
5 : AX3
7.15.3
7 : Oxides and Hydroxides
15 : Oxides of Mo and W
7 : Oxides and Hydroxides
15 : Oxides of Mo and W
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Sdw | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Sidwillite
Resinous
Transparency:
Translucent
Comment:
(Cesbron and Ginderow 1985)
Colour:
Canary-yellow
Comment:
pleochroic, colorless - yellow at 47° ^ a-axis (Cesbron and Ginderow 1985)
Streak:
pale yellow
Hardness:
2½ on Mohs scale
Cleavage:
Perfect
[010] (Cesbron and Ginderow 1985)
[010] (Cesbron and Ginderow 1985)
Density:
3.12 g/cm3 (Measured) 3.11 g/cm3 (Calculated)
Comment:
Data from Cesbron and Ginderow 1985
Optical Data of Sidwillite
Type:
Biaxial (-)
RI values:
nα = 1.700(1) nβ = 2.210(2) nγ = 2.380(2)
2V:
Measured: 48° , Calculated: 48°
Max Birefringence:
δ = 0.680
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
relatively weak
Pleochroism:
Strong
Comments:
X = colorless; Y = Z = yellow.
Chemistry of Sidwillite
Mindat Formula:
MoO3 · 2H2O
Elements listed:
Crystallography of Sidwillite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 10.618(5) Å, b = 13.825(7) Å, c = 10.482(5) Å
β = 91.61(4)°
β = 91.61(4)°
Ratio:
a:b:c = 0.768 : 1 : 0.758
Unit Cell V:
1,538.09 ų (Calculated from Unit Cell)
Z:
16
Comment:
Space Group: P21/n.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
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Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0009439 | Sidwillite | Krebs B (1972) Die kristallstruktur von MoO3*2H2O Acta Crystallographica B28 2222-2231 | 1972 | synthetic | 0 | 293 | |
0020017 | Sidwillite | Cesbron F, Ginderow D (1985) La sidwillite, MoO3*2H2O; une nouvelle espece minerale de Lake Como, Colorado, U.S.A. Bulletin de Mineralogie 108 813-823 | 1985 | Lake Como, Colorado, USA | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.322 Å | (100) |
3.248 Å | (93) |
6.94 Å | (84) |
3.680 Å | (58) |
3.79 Å | (53) |
2.656 Å | (51) |
2.620 Å | (41) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] |
Type Occurrence of Sidwillite
Place of Conservation of Type Material:
Collection de Mineralogie de I'Ecole nationale superieure
des Mines de Paris.
des Mines de Paris.
Geological Setting of Type Material:
quartz vein
Associated Minerals at Type Locality:
Reference:
Cesbron, F., Ginderow, D. (1985) Sidwillite MoO3·2H2O; a new mineral species from Lake Como, Colorado, U.S.A. Bulletin de la Société française de Minéralogie et de Cristallographie 108: 813-823.
Synonyms of Sidwillite
Other Language Names for Sidwillite
Common Associates
Associated Minerals Based on Photo Data:
11 photos of Sidwillite associated with Raydemarkite | MoO3 · H2O |
2 photos of Sidwillite associated with Baryte | BaSO4 |
2 photos of Sidwillite associated with Ilsemannite | Mo3O8 · nH2O |
1 photo of Sidwillite associated with Quartz | SiO2 |
1 photo of Sidwillite associated with Molybdite | MoO3 |
1 photo of Sidwillite associated with Jordisite | MoS2 |
Related Minerals - Strunz-mindat Grouping
4.FJ. | Raydemarkite | MoO3 · H2O |
4.FJ.05 | Meymacite | WO3 · 2H2O |
4.FJ.10 | Tungstite | WO3 · H2O |
4.FJ.15 | Hydrotungstite | WO3 · 2H2O |
4.FJ.15 | Ilsemannite | Mo3O8 · nH2O |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Sidwillite
mindat.org URL:
https://www.mindat.org/min-3654.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
References for Sidwillite
Reference List:
Krebs, B. (1972) Die Kristallstruktur von MoO3.2H2O. Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry, 28 (7) 2222-2231 doi:10.1107/s0567740872005849
Localities for Sidwillite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
USA (TL) | |
| Eckel et al. (1997) |
| Ramon S. DeMark +4 other references |
| Collected by and in the collection of ... |
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Cookes Peak Mining District, Luna County, New Mexico, USA