Wendwilsonite Mineral Data

General Wendwilsonite Information

Chemical Formula:

Ca2(Mg,Co)(AsO4)2•2(H2O)

Composition:

Molecular Weight = 426.99 gm

Calcium 18.77 % Ca 26.27 % CaO

Magnesium 4.27 % Mg 7.08 % MgO

Cobalt 3.45 % Co 4.39 % CoO

Arsenic 35.09 % As 53.83 % As₂O₅

Hydrogen 0.94 % H 8.44 % H₂O

Oxygen 37.47 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂Mg_0.75Co_0.25(AsO₄)₂•2(H₂O)

Environment:

Found with calcite on serpentine in franklinite-willemite ore.

IMA Status:

Approved IMA 1987

Locality:

Sterling Hill mine, Ogdensburg, New Jersy, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Wendell E. Wilson (1946-), mineralogist, editor, and publisher of the Mineralogical Record.

Name Pronunciation:

Wendwilsonite

Wendwilsonite Image

Images:

Wendwilsonite

Comments: Gemmy crystals of wendwilsonite to 4 mm.
Location: Bou Azzer, Anti-Atlas Mts., Morocco. Scale: Picture size .5 cm.
© John Veevaert

Images:

Wendwilsonite Minrecordite

Comments: Wendell Wilson, publisher, editor-in-chief of the Mineralogical Record, and the person whom wendwilsonite was named after, kindly provided the mineral name pronunciations for minrecordite and wendwilsonite.
Location: Tucson Convention Center, 50th Tucson Gem and Mineral Show, February 14, 2004. Scale: NA.
© Dave Barthelmy

Wendwilsonite Crystallography

Axial Ratios:

a:b:c =0.4496:1:0.4354

Cell Dimensions:

a = 5.806, b = 12.912, c = 5.623, Z = 2; beta = 107.4° V = 402.25 Den(Calc)= 3.53

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.994(1), 2.766(0.8), 3.226(0.6),

Crystal Structure:

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Kolitsch U , Fleck M , European Journal of Mineralogy , 18 (2006) p.471-482, 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), Locality: Schneeberg, Saxony, Germany

Physical Properties of Wendwilsonite

Cleavage:

{010} Perfect

Color:

Light pink, Dark pink, Red.

Density:

3.52

Diaphaneity:

Transparent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

3-4 - Calcite-Fluorite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

light pink

Optical Properties of Wendwilsonite

Gladstone-Dale:

CI meas= -0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.032 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1992,KPDmeas= 0.1998,KC= 0.1931
Ncalc = 1.68

Optical Data:

Biaxial (+), a=1.694, b=1.703, g=1.713, bire=0.0190, 2V(Calc)=88, 2V(Meas)=87. Dispersion r < v.

Pleochroism (x):

violet pink.

Pleochroism (y):

rose pink.

Pleochroism (z):

colorless.

Calculated Properties of Wendwilsonite

Electron Density:

Bulk Density (Electron Density)=3.40 gm/cc
note: Specific Gravity of Wendwilsonite =3.53 gm/cc.

Fermion Index:

Fermion Index = 0.0047038609
Boson Index = 0.9952961391

Photoelectric:

PE_{Wendwilsonite}= 27.25 barns/electron
U=PE_{Wendwilsonite} x rElectron Density= 92.72 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Wendwilsonite is Not Radioactive

Wendwilsonite Classification

Dana Class:

40.02.03.04 (40)Hydrated Phosphates, etc

(40.02)where A++ (B++)2 (XO4) · x(H2O)

(40.02.03)Roselite Subgroup (Monoclinic: P21/c)

40.02.03.01 Roselite Ca2(Co,Mg)(AsO4)2•2(H2O) P 2₁/c 2/m

40.02.03.02 Brandtite Ca2(Mn,Mg)(AsO4)2•2(H2O) P 2₁/c 2/m

40.02.03.03 Zincroselite Ca2Zn(AsO4)2•2(H2O) P 2₁/c 2/m

40.02.03.04 Wendwilsonite Ca2(Mg,Co)(AsO4)2•2(H2O) P 2₁/c 2/m

40.02.03.05 Manganlotharmeyerite! Ca(Mn,Mg,)2(AsO4)2(OH,H2O)2 C 2/m 2/m

Strunz Class:

08.CG.10 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CG -With large and medium-sized cations, RO4:H2O = 1:1

08.CG.10 Brandtite Ca2(Mn,Mg)(AsO4)2•2(H2O) P 2₁/c 2/m

08.CG.10 Roselite Ca2(Co,Mg)(AsO4)2•2(H2O) P 2₁/c 2/m

08.CG.10 Roselite-beta Ca2(Co,Mg)(AsO4)2•2(H2O) P 1 or P1 Tri

08.CG.10 Zincroselite Ca2Zn(AsO4)2•2(H2O) P 2₁/c 2/m

08.CG.10 Wendwilsonite Ca2(Mg,Co)(AsO4)2•2(H2O) P 2₁/c 2/m

Other Wendwilsonite Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.72,p217-221,1987) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Wendwilsonite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Print or Cut-and-Paste your Wendwilsonite Specimen Label here :

Wendwilsonite

Ca2(Mg,Co)(AsO4)2•2(H2O)
Dana No: 40.02.03.04 Strunz No: 08.CG.10
Locality:

Notes: