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Wendwilsonite

A valid IMA mineral species
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00885810014949446947695.jpg
Wendwilsonite

Bou Azzer mining district, Drâa-Tafilalet Region, Morocco
05947800015894658027044.jpg
Wendwilsonite

Bou Azzer mining district, Drâa-Tafilalet Region, Morocco
05632510014949447012291.jpg
Wendwilsonite

Bou Azzer mining district, Drâa-Tafilalet Region, Morocco
04724240014946718208896.jpg
Wendwilsonite

Bou Azzer mining district, Drâa-Tafilalet Region, Morocco
09697280015894466723138.jpg
Wendwilsonite

Bou Azzer mining district, Drâa-Tafilalet Region, Morocco
00828370014947401759765.jpg
Wendwilsonite

Bou Azzer mining district, Drâa-Tafilalet Region, Morocco
00885810014949446947695.jpg
Wendwilsonite

Bou Azzer mining district, Drâa-Tafilalet Region, Morocco
05947800015894658027044.jpg
Wendwilsonite

Bou Azzer mining district, Drâa-Tafilalet Region, Morocco
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About WendwilsoniteHide

03763910014946990588958.jpg
Wendell Wilson
Formula:
Ca2Mg(AsO4)2 · 2H2O
Often contains some Co replacing Mg.
Colour:
Pale pink to red.
Lustre:
Vitreous
Hardness:
3 - 4
Specific Gravity:
3.52
Crystal System:
Monoclinic
Member of:
Roselite Group
Name:
Named in 1987 by Pete J. Dunn,, Bozidar Darko Sturman, Joseph A. Nelen in honor of Dr. Wendell E. Wilson (1946 - ), editor and publisher of the Mineralogical Record.
Dimorph of:
Talmessite
Isostructural with:
Brandtite
Roselite Group, Roselite-Wendwilsonite Series.

The magnesium analogue of Roselite.


Unique IdentifiersHide

Mindat ID:
4268
Long-form identifier:
mindat:1:1:4268:6
GUID
(UUID V4):
b7d03a74-46d2-4ca8-a056-b3c5b027ab24

IMA Classification of WendwilsoniteHide

Classification of WendwilsoniteHide

Strunz-mindat (2024):
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
Dana 8th ed.:
40.2.3.4

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2 : AB2(XO4)2·xH2O
Hey's CIM Ref.:
20.10.5

20 : Arsenates (also arsenates with phosphate, but without other anions)
10 : Arsenates of Co and Ni

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
WdwIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of WendwilsoniteHide

Lustre:
Vitreous
Transparency:
Transparent, Translucent
Colour:
Pale pink to red.
Streak:
pale pink
Hardness:
3 - 4 on Mohs scale
Cleavage:
Perfect
{010}
Fracture:
Irregular/Uneven
Density:
3.52(8) g/cm3 (Measured)    3.478 g/cm3 (Calculated)

Optical Data of WendwilsoniteHide

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
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
weak to distinct
Pleochroism:
Visible
Comments:
X = violet-pink; Y = rose-pink; Z = colorless.

Chemistry of WendwilsoniteHide

Mindat Formula:
Ca2Mg(AsO4)2 · 2H2O

Often contains some Co replacing Mg.
Elements listed:
As, Ca, H, Mg, O - search for minerals with similar chemistry

Crystallography of WendwilsoniteHide

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°
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 StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0007158WendwilsoniteKolitsch 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 18 471-4822006Schneeberg, Saxony, Germany0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacingIntensity
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 EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
47d : [Arsenates, antimonates, selenates, bismuthinates]

Type Occurrence of WendwilsoniteHide

Co-Type Localities:
ⓘ Bou Azzer mining district, Drâa-Tafilalet Region, Morocco
ⓘ Sterling Mine, Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA
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:
TalmessiteErythrite
Reference:
Dunn, P. J., Sturman, B. D., Nelen, J. A. (1987): Wendwilsonite, the magnesium analogue of roselite, from Morocco, New Jersey, and Mexico, and new data on roselite. American Mineralogist, 72, 217-221.

Synonyms of WendwilsoniteHide

Other Language Names for WendwilsoniteHide

Relationship of Wendwilsonite to other SpeciesHide

Member of:
Roselite Group
Other Members of this group:
BrandtiteCa2Mn2+(AsO4)2 · 2H2OMon. 2/m : P21/b
DobšináiteCa2Ca(AsO4)2 · 2H2OMon. 2/m : P21/b
KröhnkiteNa2Cu(SO4)2 · 2H2OMon. 2/m : P21/b
RoseliteCa2Co(AsO4)2 · 2H2OMon. 2/m : P21/b
RruffiteCa2Cu(AsO4)2 · 2H2OMon. 2/m : P21/b
Unnamed (Fe2+-analogue of Brandtite)Ca2Fe2+(AsO4)2 · 2H2O
ZincroseliteCa2Zn(AsO4)2 · 2H2OMon. 2/m : P21/b
Forms a series with:
RoseliteRoselite-Wendwilsonite Series

Common AssociatesHide

Associated Minerals Based on Photo Data:
26 photos of Wendwilsonite associated with CalciteCaCO3
12 photos of Wendwilsonite associated with DolomiteCaMg(CO3)2
9 photos of Wendwilsonite associated with QuartzSiO2
8 photos of Wendwilsonite associated with CobaltaustiniteCaCo(AsO4)(OH)
8 photos of Wendwilsonite associated with SkutteruditeCoAs3
7 photos of Wendwilsonite associated with ErythriteCo3(AsO4)2 · 8H2O
6 photos of Wendwilsonite associated with TalmessiteCa2Mg(AsO4)2 · 2H2O
6 photos of Wendwilsonite associated with RoseliteCa2Co(AsO4)2 · 2H2O
6 photos of Wendwilsonite associated with NickelaustiniteCaNi(AsO4)(OH)
6 photos of Wendwilsonite associated with CobaltlotharmeyeriteCaCo2(AsO4)2 · 2H2O

Related Minerals - Strunz-mindat GroupingHide

8.CG.Ca-HuréauliteCaMn5(PO4)4 · 4H2O
8.CG.FluckiteCaMn2+(AsO3OH)2 · 2H2OTric. 1 : P1
8.CG.DondoelliteCa2Fe(PO4)2 · 2H2OTric. 1 : P1
8.CG.AlumolukrahniteCa[CuAl](AsO4)2(H2O,OH)2Tric. 1 : P1
8.CG.05CassidyiteCa2Ni(PO4)2 · 2H2OTric.
8.CG.05CollinsiteCa2Mg(PO4)2 · 2H2OTric. 1 : P1
8.CG.05FairfielditeCa2Mn2+(PO4)2 · 2H2OTric. 1 : P1
8.CG.05GaititeCa2Zn(AsO4)2 · 2H2OTric. 1 : P1
8.CG.05MesseliteCa2Fe2+(PO4)2 · 2H2OTric. 1 : P1
8.CG.05ParabrandtiteCa2Mn2+(AsO4)2 · 2H2OTric. 1 : P1
8.CG.05AnorthoroseliteCa2Co(AsO4)2 · 2H2OTric.
8.CG.05TalmessiteCa2Mg(AsO4)2 · 2H2OTric. 1 : P1
8.CG.05HilliteCa2Zn(PO4)2 · 2H2OTric. 1 : P1
8.CG.05Unnamed (Fe2+-analogue of Parabrandtite)Ca2Fe2+(AsO4)2 · 2H2O
8.CG.10BrandtiteCa2Mn2+(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.10RoseliteCa2Co(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.10ZincroseliteCa2Zn(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.10RruffiteCa2Cu(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.10Unnamed (Fe2+-analogue of Brandtite)Ca2Fe2+(AsO4)2 · 2H2O
8.CG.15FerrilotharmeyeriteCaZnFe3+(AsO4)2(OH) · H2OMon. 2/m : B2/m
8.CG.15LotharmeyeriteCaZn2(AsO4)2 · 2H2OMon. 2/m : B2/m
8.CG.15MawbyitePbFe3+2(AsO4)2(OH)2Mon. 2/m : B2/m
8.CG.15MounanaitePbFe3+2(VO4)2(OH,F)2Mon. 2/m : B2/m
8.CG.15ThometzekitePbCu2+2(AsO4)2 · 2H2OMon. 2/m : B2/m
8.CG.15TsumcoritePbZn2(AsO4)2 · 2H2OMon. 2/m : B2/m
8.CG.15CobaltlotharmeyeriteCaCo2(AsO4)2 · 2H2OMon. 2/m : B2/m
8.CG.15CabalzariteCaMg2(AsO4)2 · 2H2OMon. 2/m : B2/m
8.CG.15KrettnichitePbMn3+2(VO4)2(OH)2Mon. 2/m : B2/m
8.CG.15CobalttsumcoritePbCo2(AsO4)2 · 2H2OMon. 2/m : B2/m
8.CG.15NickellotharmeyeriteCaNi2(AsO4)2 · 2H2OMon. 2/m : B2/m
8.CG.15ManganlotharmeyeriteCaMn3+2(AsO4)2(OH)2Mon. 2/m : B2/m
8.CG.15SchneebergiteBiCo2(AsO4)2(OH) · H2OMon. 2/m : B2/m
8.CG.15NickelschneebergiteBiNi2(AsO4)2(OH) · H2OMon. 2/m : B2/m
8.CG.15YancowinnaitePbCuAl(AsO4)2OH · H2O Tric. 1 : P1
8.CG.15NickeltsumcoritePb(Ni,Fe3+)2(AsO4)2(H2O,OH)2Mon. 2/m : B2/m
8.CG.15MagnesiofluckiteCaMg(AsO3OH)2(H2O)2Tric. 1 : P1
8.CG.20GartrellitePbCuFe3+(AsO4)2(OH) · H2OTric. 1 : P1
8.CG.20HelmutwinkleritePbZn2(AsO4)2 · 2H2OTric. 1 : P1
8.CG.20ZincgartrellitePbZn2(AsO4)2(H2O,OH)2Tric. 1 : P1
8.CG.20RappolditePbCo2(AsO4)2 · 2H2OTric. 1 : P1
8.CG.20PhosphogartrellitePbCuFe3+(PO4)2(OH,H2O)2Tric. 1 : P1
8.CG.20LukrahniteCaCuFe3+(AsO4)2(OH,H2O)2Tric. 1 : P1
8.CG.25Pottsite(Pb3xBi4-2x)(VO4)4 · H2O (0.8 < x < 1.0)Tet. 4/m : I41/a
8.CG.25Armellinoite-(Ce)Ca4Ce4+(AsO4)4 · H2OTet. 4/m : I41/a
8.CG.35NickeltalmessiteCa2Ni(AsO4)2 · 2H2OTric. 1 : P1
8.CG.55IrhtemiteCa4Mg(AsO4)2(HAsO4)2 · 4H2OMon.

Other InformationHide

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 WendwilsoniteHide

References for WendwilsoniteHide

Localities for WendwilsoniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- 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.
Azerbaijan
 
  • Dashkasan District
    • Dashkasan
Pekov et al. (2001)
Chile
 
  • Atacama
    • Copiapó Province
      • Tierra Amarilla
        • Pampa Larga mining district
samples analysed by Gerhard Mohn and ... +1 other reference
  • Tarapacá
    • Iquique Province
samples analysed by Anthony Kampf
Germany
 
  • Saxony
    • Erzgebirgskreis
81-82 +2 other references
Morocco (TL)
 
  • Drâa-Tafilalet Region
Dunn et al. (1987)
    • Zagora Province
      • Agdz Cercle
        • Tansifte Caïdat
          • Aghbar
Meisser +4 other references
Favreau et al. (2006)
USA (TL)
 
  • New Jersey
    • Sussex County
      • Ogdensburg
        • Sterling Hill
Dunn et al. (1987) +1 other reference
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