Willemseite Mineral Data + 
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- 71.2.1.1 Pyrophyllite Al2Si4O10(OH)2 P1 1
- 71.2.1.2 Ferripyrophyllite Fe2Si4O10(OH)2 C 2/m 2/m
- 71.2.1.3 Talc Mg3Si4O10(OH)2 C 2/c 2/m
- 71.2.1.4 Willemseite (Ni,Mg)3Si4O10(OH)2 C 2/c 2/m
- 71.2.1.5 Minnesotaite (Fe,Mg)3Si4O10(OH)2 C1 1
- 71.2.1.6 Brinrobertsite! (Na,K,Ca)x(Al,Fe,Mg)4(Si,Al)8O20(OH)4·3.54(H2O)[x=0.35,n=3.54] pseudo 2/m 2/m
- VIII/H.09-10 Pyrophyllite Al2Si4O10(OH)2 P1 1
- VIII/H.09-20 Ferripyrophyllite Fe2Si4O10(OH)2 C 2/m 2/m
- VIII/H.09-30 Macaulayite (Fe,Al)24Si4O43(OH)2 C? Mono
- VIII/H.09-40 Talc Mg3Si4O10(OH)2 C 2/c 2/m
- VIII/H.09-50 Minnesotaite (Fe,Mg)3Si4O10(OH)2 C1 1
- VIII/H.09-60 Willemseite (Ni,Mg)3Si4O10(OH)2 C 2/c 2/m
- VIII/H.09-65 Pimelite Ni3Si4O10(OH)2·4(H2O) Unk. Hex
- VIII/H.09-70 Kegelite Pb8Al4Si8O20(SO4)2(CO3)4(OH)8 A2/m,A2,Am Mono
General Willemseite Information |
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 Chemical Formula: |
(Ni,Mg)3Si4O10(OH)2 | ||
| Composition: |
Molecular Weight = 456.63 gm | ||
| Magnesium 3.99 % Mg 6.62 % MgO | |||
| Silicon 24.60 % Si 52.63 % SiO2 | |||
| Nickel 28.92 % Ni 36.80 % NiO | |||
| Hydrogen 0.44 % H 3.95 % H2O | |||
| Oxygen 42.05 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Ni2.25Mg0.75Si4O10(OH)2 | ||
| IMA Status: |
Approved IMA 1970 | ||
| Locality: |
Link to MinDat.org Location Data. | ||
Willemseite Image | |||
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Willemseite Crystallography |
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| Axial Ratios: |
a:b:c =0.581:1:2.076 | ||
| Cell Dimensions: |
a = 5.316, b = 9.149, c = 18.994, Z = 4; beta = 99.96° V = 909.87 Den(Calc)= 3.33 | ||
| Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c | ||
| X Ray Diffraction: |
By Intensity(I/Io): 9.4(1), 3.12(0.28), 2.503(0.23), | ||
Physical Properties of Willemseite |
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| Cleavage: |
[001] Perfect | ||
| Color: |
Light green. | ||
| Density: |
3.31 | ||
| Hardness: |
2 - Gypsum | ||
| Streak: |
greenish white | ||
Optical Properties of Willemseite |
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| Gladstone-Dale: |
CI meas= 0.044 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.05 (Good) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1909,KPDmeas= 0.192,KC= 0.2009 |
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| Optical Data: |
Biaxial (-), a=1.6, b=1.652, g=1.655, bire=0.0550, 2V(Calc)=26, 2V(Meas)=27. | ||
Calculated Properties of Willemseite |
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| Electron Density: |
relectron=3.28 gm/cc |
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| Fermion Index |
Fermion Index = 0.01895 Boson Index = 0.98105 |
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| Photoelectric: |
PEWillemseite = 12.39 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Willemseite is Not Radioactive |
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Willemseite Classification |
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| Dana Class: |
71.2.1.4 (71)Phyllosilicate Sheets of Six-Membered Rings | ||
| (71.2)with 2:1 Layers | |||
| (71.2.1)Pyrophyllite-talc group | |||
| Strunz Class: |
VIII/H.09-60 VIII - Silicates | ||
| VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups | |||
| VIII/H.09 - Talc series | |||
Other Willemseite Information |
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| References: |
PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Willemseite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (MinSocAm) 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas 14 -École des Mines de Paris Search for Willemseite using: Visit our Advertisers for Willemseite : Translate Willemseite Mineral Data : Ask about Willemseite here : Print or Cut-and-Paste your Willemseite Specimen Label here :
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