Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Wendwilsonite

This page is currently not sponsored. Click here to sponsor this page.
Wendell Wilson
Formula:
Ca2Mg(AsO4)2 · 2H2O
Often contains some Co replacing Mg.
System:
Monoclinic
Colour:
Pale pink to red.
Hardness:
3 - 4
Member of:
Name:
Named in 1987 by Pete J. Dunn,, Bozidar Darko Sturman, Joseph A. Nelen in honor of Dr. Wendell E. Wilson, editor and publisher of the Mineralogical Record.
Isostructural with:

Classification of Wendwilsonite

Approved 1985
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
40.2.3.4

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
mindat.org URL:
http://www.mindat.org/min-4268.html
Please feel free to link to this page.

Type Occurrence of Wendwilsonite

Year of Discovery:
1985

Physical Properties of Wendwilsonite

Vitreous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Pale pink to red.
Hardness (Mohs):
3 - 4
Density:
3.478 g/cm3 (Calculated)

Crystallography of Wendwilsonite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 5.806Å, b = 12.923Å, c = 5.628Å
β = 107.49°
Ratio:
a:b:c = 0.449 : 1 : 0.436
Unit Cell Volume:
V 402.75 ų
Z:
2
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Wendwilsonite

Type:
Biaxial (+)
RI values:
nα = 1.694 nβ = 1.703 nγ = 1.713
2V:
Measured: 87° , 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

Chemical Properties of Wendwilsonite

Formula:
Ca2Mg(AsO4)2 · 2H2O

Often contains some Co replacing Mg.
Essential elements:
All elements listed in formula:

Relationship of Wendwilsonite to other Species

Series:
Forms a series with Roselite (see here)
Member of:
Other Members of Group:
BrandtiteCa2(Mn2+,Mg)(AsO4)2 · 2H2O
KröhnkiteNa2Cu(SO4)2 · 2H2O
RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2O
RruffiteCa2Cu(AsO4)2 · 2H2O
Unnamed (Fe2+-analogue of Brandtite)Ca2Fe2+(AsO4)2 · 2H2O
ZincroseliteCa2Zn(AsO4)2 · 2H2O
8.CG.05CassidyiteCa2(Ni2+,Mg)(PO4)2 · 2H2O
8.CG.05CollinsiteCa2(Mg,Fe2+)(PO4)2 · 2H2O
8.CG.05FairfielditeCa2(Mn2+,Fe2+)(PO4)2 · 2H2O
8.CG.05GaititeCa2Zn(AsO4)2 · 2H2O
8.CG.05MesseliteCa2(Fe2+,Mn2+)(PO4)2 · 2H2O
8.CG.05ParabrandtiteCa2Mn2+(AsO4)2 · 2H2O
8.CG.05TalmessiteCa2Mg(AsO4)2 · 2H2O
8.CG.05HilliteCa2(Zn,Mg)(PO4)2 · 2 H2O
8.CG.10BrandtiteCa2(Mn2+,Mg)(AsO4)2 · 2H2O
8.CG.10RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2O
8.CG.10ZincroseliteCa2Zn(AsO4)2 · 2H2O
8.CG.10RruffiteCa2Cu(AsO4)2 · 2H2O
8.CG.15FerrilotharmeyeriteCa(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)
8.CG.15LotharmeyeriteCa(Zn,Mn3+)2(AsO4)2 · 2(H2O,OH)
8.CG.15MawbyitePb(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)
8.CG.15MounanaitePbFe23+(VO4)2(OH,F)2
8.CG.15ThometzekitePb(Cu,Zn)2(AsO4,SO4)2 · 2(H2O,OH)
8.CG.15TsumcoritePb(Zn,Fe3+)2(AsO4)2 · 2(H2O,OH)
8.CG.15CobaltlotharmeyeriteCa(Co,Fe3+,Ni)2(AsO4)2 · 2(H2O,OH)
8.CG.15CabalzariteCa(Mg,Al,Fe3+)2(AsO4)2(OH,H2O)2
8.CG.15Krettnichite(Pb,Sr)(Mn3+,Co)2(VO4)2 · 2(OH,H2O)
8.CG.15CobalttsumcoritePb(Co,Fe3+,Ni)2(AsO4)2 · 2(H2O,OH)
8.CG.15NickellotharmeyeriteCa(Ni,Fe3+,Co)2(AsO4)2 · 2(H2O,OH)
8.CG.15ManganlotharmeyeriteCa(Mn3+,Zn)2(AsO4)2(OH,H2O)2
8.CG.15Schneebergite(Bi3+,Ca)(Co,Ni,Fe3+)2(AsO4)2(OH,H2O)2
8.CG.15Nickelschneebergite(Bi3+,Ca)(Ni,Co,Fe3+)2(AsO4)2 · 2(OH,H2O)
8.CG.20GartrellitePb(Cu,Fe3+,Zn)2(AsO4,SO4)2 · 2(H2O,OH)
8.CG.20HelmutwinkleritePb(Zn,Cu)2(AsO4)2 · 2H2O
8.CG.20ZincgartrellitePb(Zn,Fe3+,Cu)2(AsO4)2 · 2(H2O,OH)
8.CG.20RappolditePb(Co,Ni,Zn)2(AsO4)2 · 2H2O
8.CG.20PhosphogartrellitePb(Cu,Fe3+)2(PO4,AsO4)2 · 2(H2O,OH)
8.CG.20LukrahniteCa(Cu,Zn)(Fe3+,Zn)(AsO4)2 · 2(H2O,OH)
8.CG.25PottsiteHPbBi(VO4)2 · 2H2O
8.CG.35NickeltalmessiteCa2Ni(AsO4)2 · 2H2O
20.10.1ErythriteCo3(AsO4)2 · 8H2O
20.10.2CobaltaustiniteCaCo(AsO4)(OH)
20.10.3RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2O
20.10.4β-RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2O
20.10.6Cobaltkoritnigite(Co,Zn)(HAsO4) · H2O
20.10.7AerugiteNi8.5(AsO4)2As5+O8
20.10.8XanthiositeNi3(AsO4)2
20.10.9AnnabergiteNi3(AsO4)2 · 8H2O
20.10.10Smolyaninovite(Co,Ni,Mg,Ca)3(Fe3+,Al)2(AsO4)4 · 11H2O
20.10.11NickelaustiniteCa(Ni,Zn)(AsO4)(OH)

Other Names for Wendwilsonite

Name in Other Languages:

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.

References for Wendwilsonite

Reference List:
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.

Weiss, S., Lengauer, C.L., Parodi, G.C. (2002): Roselith, Wendwilsonit und kobalthaltiger Talmessit aus Bou Azzer, Marokko. Lapis 27 (1), 37-41; 58. (in German)

Kolitsch, U. & Fleck, M. (2006): Third update on compounds with kröhnkite-type chains: the crystal structure of wendwilsonite [Ca2Mg(AsO4)2·2H2O] and the new triclinic structure types of AgSc(CrO4)2·2H2O and M2Cu(Cr2O7)2·2H2O (M = Rb, Cs). European Journal of Mineralogy, 18, 471-482.

Internet Links for Wendwilsonite

Specimens:
The following Wendwilsonite specimens are currently listed for sale on minfind.com.

Localities for Wendwilsonite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Azerbaijan
 
  • Daşkəsən District (Daskasan; Dashkyasan)
    • Dashkesan
Pekov, I. V., Vinogradova, R. A., Chukanov, N. V., & Kulikova, I. M. (2001). On magnesian and cobalt arsenates of the fairfieldite and roselite groups. Zapiski Vseross. Mineral. Obshch.(Proc. Russ. Miner. Soc.), 130(4), 10-23.
Chile
 
  • Tarapacá Region
    • El Tamarugal Province
      • Salar Grande
samples analysed by Anthony Kampf, Curator Emeritus of Mineral Sciences at NHM of LAC, California
Germany
 
  • Saxony
    • Erzgebirge
J. Gröbner und U. Kolitsch (2005), Lapis 30 (7-8), 71-73; 81-82; Kolitsch & Fleck (2006), European Journal of Mineralogy, 18, 471-482.
Morocco (TL)
 
  • Souss-Massa-Draâ Region
    • Ouarzazate Province
      • Tazenakht
Dunn, P.J., et al (1987) American Mineralogist:72: 217-221.
          • Aghbar
Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68; Meisser, N.; Brugger, J.; Krivovichev, S.; Armbruster, T.; Favreau, G. (2012): Description and crystal structure of maghrebite, MgAl2(AsO4)2(OH)2•8H2O, from Aghbar, Anti-Atlas, Morocco: first arsenate in the laueite mineral group. European Journal of Mineralogy 24, 717-726.
          • Bou Azer
Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
USA (TL)
 
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Ogdensburg
          • Sterling Hill
Dunn, P.J., et al: Am.Min.:72:217-221 (1987); Dunn(1995):Pt5:685.
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2015, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: August 4, 2015 00:28:30 Page generated: August 3, 2015 15:26:02