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 % As2 O5
Hydrogen 0.94 % H 8.44 % H2 O
Oxygen 37.47 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Ca2 Mg0.75 Co0.25 (AsO4 )2 •2(H2 O)
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 - Prismatic H-M Symbol (2/m) Space Group: P 21 /c
X Ray Diffraction:
By Intensity(I/Io ): 2.994(1), 2.766(0.8), 3.226(0.6),
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:
PEWendwilsonite = 27.25 barns/electronU=PEWendwilsonite x r Electron 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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Wendwilsonite
Ca2(Mg,Co)(AsO4)2•2(H2O)
Dana No: 40.02.03.04 Strunz No: 08.CG.10
Locality:
Notes:
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