Wendwilsonite
A valid IMA mineral species
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About Wendwilsonite
Wendell Wilson
Formula:
Ca2Mg(AsO4)2 · 2H2O
Often contains some Co replacing Mg.
Colour:
Pale pink to red, white
Lustre:
Vitreous
Hardness:
3 - 4
Specific Gravity:
3.52
Crystal System:
Monoclinic
Member of:
Name:
Named in 1987 by Pete J. Dunn, Bozidar Darko Sturman, and Joseph A. Nelen in honour of Dr. Wendell E. Wilson (1946 - ), editor and publisher of the Mineralogical Record.
Co-Type Localities:
Dimorph of:
Isostructural with:
Unique Identifiers
Mindat ID:
4268
Long-form identifier:
mindat:1:1:4268:6
IMA Classification of Wendwilsonite
Approved
Approval year:
1985
Classification of Wendwilsonite
8.CG.10
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1
40.2.3.4
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2 : AB2(XO4)2·xH2O
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2 : AB2(XO4)2·xH2O
20.10.5
20 : Arsenates (also arsenates with phosphate, but without other anions)
10 : Arsenates of Co and Ni
20 : Arsenates (also arsenates with phosphate, but without other anions)
10 : Arsenates of Co and Ni
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 |
|---|---|---|
| Wdw | 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 Wendwilsonite
Vitreous
Transparency:
Transparent, Translucent
Colour:
Pale pink to red, white
Streak:
Pale pink
Hardness:
3 - 4 on Mohs scale
Cleavage:
Perfect
{010}
{010}
Fracture:
Irregular/Uneven
Density:
3.52(8) g/cm3 (Measured) 3.478 g/cm3 (Calculated)
Optical Data of Wendwilsonite
Type:
Biaxial (+)
RI values:
nα = 1.694(3) nβ = 1.703(3) nγ = 1.713(3)
2V:
Measured: 87° (2), Calculated: 88°
Max. Birefringence:
δ = 0.019
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Dispersion:
weak to distinct
Pleochroism:
Visible
Comments:
X = violet-pink; Y = rose-pink; Z = colorless.
Chemistry of Wendwilsonite
Mindat Formula:
Ca2Mg(AsO4)2 · 2H2O
Often contains some Co replacing Mg.
Often contains some Co replacing Mg.
Element Weights:
Crystallography of Wendwilsonite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 5.806(1) Å, b = 12.923(2) Å, c = 5.628(2) Å
β = 107.49°
β = 107.49°
Ratio:
a:b:c = 0.449 : 1 : 0.436
Unit Cell V:
402.75 ų
Z:
2
Twinning:
On {100} as twin and composition plane; lamellar structure parallel to {010}, {011}, {111} visible optically.
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0007158 | Wendwilsonite | Kolitsch U, Fleck M (2006) Third update on compounds with krohnkite-type chains: the crystal structure of wendwilsonite [Ca2Mg(AsO4)2*2H2O] and the new triclinic structure types of synthetic AgSc(CrO4)2*2H2O and M2Cu(Cr2O7)2*2H2O (M = Rb, Cs) European Journal of Mineralogy 18 471-482 | 2006 | Schneeberg, Saxony, Germany | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Loading XRD data...
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.994 Å | (100) |
| 2.766 Å | (80) |
| 3.226 Å | (60) |
| 5.085 Å | (50) |
| 3.356 Å | (40) |
| 2.592 Å | (40) |
| 3.397 Å | (30) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Wendwilsonite
Co-Type Localities:
General Appearance of Type Material:
Crystals are stout prismatic
Place of Conservation of Type Material:
Royal Ontario Museum, Toronto, Canada, M42119; National Museum of Natural History, Washington, D.C., USA, 136288.
Associated Minerals at Type Locality:
Synonyms of Wendwilsonite
Other Language Names for Wendwilsonite
Relationship of Wendwilsonite to other Species
Member of:
Other Members of Brandtite Group:
| Brandtite | Ca2Mn2+(AsO4)2 · 2H2O | Mon. 2/m : P21/b |
| Dobšináite | Ca2Ca(AsO4)2 · 2H2O | Mon. 2/m : P21/b |
| Kröhnkite | Na2Cu(SO4)2 · 2H2O | Mon. 2/m : P21/b |
| Roselite | Ca2Co(AsO4)2 · 2H2O | Mon. 2/m : P21/b |
| Rruffite | Ca2Cu(AsO4)2 · 2H2O | Mon. 2/m : P21/b |
| Zincroselite | Ca2Zn(AsO4)2 · 2H2O | Mon. 2/m : P21/b |
Forms a series with:
Common Associates
Associated Minerals Based on Photo Data:
| 26 photos of Wendwilsonite associated with Calcite | CaCO3 |
| 12 photos of Wendwilsonite associated with Dolomite | CaMg(CO3)2 |
| 9 photos of Wendwilsonite associated with Quartz | SiO2 |
| 8 photos of Wendwilsonite associated with Cobaltaustinite | CaCo(AsO4)(OH) |
| 8 photos of Wendwilsonite associated with Skutterudite | CoAs3 |
| 7 photos of Wendwilsonite associated with Erythrite | Co3(AsO4)2 · 8H2O |
| 6 photos of Wendwilsonite associated with Nickelaustinite | CaNi(AsO4)(OH) |
| 6 photos of Wendwilsonite associated with Roselite | Ca2Co(AsO4)2 · 2H2O |
| 6 photos of Wendwilsonite associated with Talmessite | Ca2Mg(AsO4)2 · 2H2O |
| 6 photos of Wendwilsonite associated with Cobaltlotharmeyerite | CaCo2(AsO4)2 · 2H2O |
Related Minerals - Strunz-mindat Grouping
| 8.CG. | Fluckite | CaMn2+(AsO3OH)2 · 2H2O |
| 8.CG. | Dondoellite | Ca2Fe(PO4)2 · 2H2O |
| 8.CG. | Ca-Huréaulite | CaMn5(PO4)4 · 4H2O |
| 8.CG. | Alumolukrahnite | Ca[CuAl](AsO4)2(H2O,OH)2 |
| 8.CG.05 | Parabrandtite | Ca2Mn2+(AsO4)2 · 2H2O |
| 8.CG.05 | Talmessite | Ca2Mg(AsO4)2 · 2H2O |
| 8.CG.05 | Collinsite | Ca2Mg(PO4)2 · 2H2O |
| 8.CG.05 | Messelite | Ca2Fe2+(PO4)2 · 2H2O |
| 8.CG.05 | Gaitite | Ca2Zn(AsO4)2 · 2H2O |
| 8.CG.05 | Anorthoroselite | Ca2Co(AsO4)2 · 2H2O |
| 8.CG.05 | Cassidyite | Ca2Ni(PO4)2 · 2H2O |
| 8.CG.05 | Fairfieldite | Ca2Mn2+(PO4)2 · 2H2O |
| 8.CG.05 | Hillite | Ca2Zn(PO4)2 · 2H2O |
| 8.CG.05 | Unnamed (Fe2+-analogue of Parabrandtite) | Ca2Fe2+(AsO4)2 · 2H2O |
| 8.CG.10 | Zincroselite | Ca2Zn(AsO4)2 · 2H2O |
| 8.CG.10 | Roselite | Ca2Co(AsO4)2 · 2H2O |
| 8.CG.10 | Rruffite | Ca2Cu(AsO4)2 · 2H2O |
| 8.CG.10 | Brandtite | Ca2Mn2+(AsO4)2 · 2H2O |
| 8.CG.10 | Unnamed (Fe2+-analogue of Brandtite) | Ca2Fe2+(AsO4)2 · 2H2O |
| 8.CG.15 | Mawbyite | PbFe3+2(AsO4)2(OH)2 |
| 8.CG.15 | Thometzekite | PbCu2+2(AsO4)2 · 2H2O |
| 8.CG.15 | Yancowinnaite | PbCuAl(AsO4)2OH · H2O |
| 8.CG.15 | Schneebergite | BiCo2(AsO4)2(OH) · H2O |
| 8.CG.15 | Cabalzarite | CaMg2(AsO4)2 · 2H2O |
| 8.CG.15 | Nickelschneebergite | BiNi2(AsO4)2(OH) · H2O |
| 8.CG.15 | Lotharmeyerite | CaZn2(AsO4)2 · 2H2O |
| 8.CG.15 | Nickeltsumcorite | Pb(Ni,Fe3+)2(AsO4)2(H2O,OH)2 |
| 8.CG.15 | Magnesiofluckite | CaMg(AsO3OH)2(H2O)2 |
| 8.CG.15 | Krettnichite | PbMn3+2(VO4)2(OH)2 |
| 8.CG.15 | Cobalttsumcorite | PbCo2(AsO4)2 · 2H2O |
| 8.CG.15 | Manganlotharmeyerite | CaMn3+2(AsO4)2(OH)2 |
| 8.CG.15 | Tsumcorite | PbZn2(AsO4)2 · 2H2O |
| 8.CG.15 | Ferrilotharmeyerite | CaZnFe3+(AsO4)2(OH) · H2O |
| 8.CG.15 | Cobaltlotharmeyerite | CaCo2(AsO4)2 · 2H2O |
| 8.CG.15 | Mounanaite | PbFe3+2(VO4)2(OH)2 |
| 8.CG.15 | Nickellotharmeyerite | CaNi2(AsO4)2 · 2H2O |
| 8.CG.20 | Lukrahnite | CaCuFe3+(AsO4)2(OH,H2O)2 |
| 8.CG.20 | Helmutwinklerite | PbZn2(AsO4)2 · 2H2O |
| 8.CG.20 | Phosphogartrellite | PbCuFe3+(PO4)2(OH,H2O)2 |
| 8.CG.20 | Gartrellite | PbCuFe3+(AsO4)2(OH) · H2O |
| 8.CG.20 | Zincgartrellite | PbZn2(AsO4)2(H2O,OH)2 |
| 8.CG.20 | Rappoldite | PbCo2(AsO4)2 · 2H2O |
| 8.CG.25 | Pottsite | (Pb3xBi4-2x)(VO4)4 · H2O (0.8 < x < 1.0) |
| 8.CG.25 | Armellinoite-(Ce) | Ca4Ce4+(AsO4)4 · H2O |
| 8.CG.35 | Nickeltalmessite | Ca2Ni(AsO4)2 · 2H2O |
| 8.CG.55 | Irhtemite | Ca4Mg(AsO4)2(HAsO4)2 · 4H2O |
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 Wendwilsonite
mindat.org URL:
https://www.mindat.org/min-4268.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 Wendwilsonite
Reference List:
Dunn, Pete J., Sturman, B. Darko, Nelen, Joseph A. (1987) Wendwilsonite, the Mg analogue of roselite, from Morocco, New Jersey, and Mexico, and new data on roselite. American Mineralogist, 72 (1-2) 217-221
Kolitsch, Uwe, Fleck, Michel (2006) Third update on compounds with krohnkite-type chains: the crystal structure of wendwilsonite [Ca2Mg(AsO4)22H2O] and the new triclinic structure types of synthetic AgSc(CrO4)22H2O and M2Cu(Cr2O7)22H2O (M = Rb, Cs) European Journal of Mineralogy, 18 (4) 471-482 doi:10.1127/0935-1221/2006/0018-0471
Localities for Wendwilsonite
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Azerbaijan | |
| Pekov et al. (2001) |
Chile | |
| samples analysed by Gerhard Mohn and ... +1 other reference |
| samples analysed by Anthony Kampf |
Germany | |
| Lorenz (2004) |
| 81-82 +2 other references |
Mexico | |
| Dunn et al. (1987) | |
Morocco (TL) | |
| Dunn et al. (1987) |
| |
| Meisser +4 other references | |
| Favreau et al. (2006) | |
USA (TL) | |
| Dunn et al. (1987) +1 other reference |
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Bou Azzer mining district, Drâa-Tafilalet Region, Morocco