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Westerveldite Mineral Data
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General Westerveldite Information
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 Chemical Formula: |
(Fe,Ni,Co)As |
| Composition: |
Molecular Weight = 131.93 gm |
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Iron 25.40 % Fe |
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Cobalt 4.47 % Co |
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Nickel 13.35 % Ni |
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Arsenic 56.79 % As |
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______ |
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100.00 % |
| Empirical Formula: |
Fe2+0.6Ni0.3Co0.1As |
| Environment: |
As minute inclusions in maucherite which occurs in chromite-nickeline ores. |
| IMA Status: |
Approved IMA 1972 |
| Locality: |
La Gallega mine, 3 km west of Ojen, Marbella Province, M�laga, Spain. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Jan Westerveld (1905-1962), Professor of Geology and Mineralogy, University of Amsterdam, The Netherlands. |
| Name Pronunciation: |
Westerveldite + Pronunciation  |
| Synonym: |
ICSD 30413 |
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PDF 12-799 |
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Westerveldite Image |
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Images:
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Westerveldite Crystallography
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| Axial Ratios: |
a:b:c =0.5789:1:0.8929 |
| Cell Dimensions: |
a = 3.457, b = 5.971, c = 5.332, Z = 4; V = 110.06 Den(Calc)= 7.96 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnam |
| X Ray Diffraction: |
By Intensity(I/Io): 2.604(1), 1.988(0.5), 2.083(0.25), |
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Physical Properties of Westerveldite
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| Color: |
Brownish white, Gray. |
| Diaphaneity: |
Opaque |
| Habit: |
Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks. |
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
| Hardness: |
5.5-6 - Knife Blade-Orthoclase |
| Luster: |
Metallic |
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Optical Properties of Westerveldite
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| RL Anisotrophism: |
Distinct in air, orange brown and bluish in oil. |
| RL Pleochroism: |
Distinct. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Westerveldite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
46.90 |
48.60 |
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| 420 nm |
46.30 |
48.50 |
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| 440 nm |
45.70 |
48.40 |
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| 460 nm |
44.90 |
48.00 |
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| 480 nm |
44.30 |
48.00 |
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| 500 nm |
43.70 |
47.80 |
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| 520 nm |
43.40 |
47.90 |
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| 540 nm |
43.40 |
47.90 |
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| 560 nm |
43.40 |
48.00 |
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| 580 nm |
43.50 |
48.00 |
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| 600 nm |
43.70 |
48.10 |
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| 620 nm |
44.10 |
48.30 |
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| 640 nm |
44.40 |
48.60 |
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| 660 nm |
44.90 |
48.90 |
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| 680 nm |
45.60 |
49.10 |
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| 700 nm |
46.20 |
49.40 |
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Calculated Relative Intensity Colors of Westerveldite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
| R1 |
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| R2 |
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Calculated Properties of Westerveldite
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| Electron Density: |
Bulk Density (Electron Density)=7.20 gm/cc
note: Specific Gravity of Westerveldite =7.96 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0068925348
Boson Index = 0.9931074652 |
| Photoelectric: |
PEWesterveldite = 55.89 barns/electron
U=PEWesterveldite x rElectron Density= 402.62 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Westerveldite is Not Radioactive |
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Westerveldite Classification
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| Dana Class: |
02.08.19.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.08)where Am Bn Xp, with (m+n):p=1:1 |
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(02.08.19)Dana Group |
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02.08.19.01 Westerveldite (Fe,Ni,Co)As Pnam 2/m 2/m 2/m |
| Strunz Class: |
02.CC.15 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.C - Metal Sulfides, M:S = 1:1 (and similar) |
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02.CC -With Ni, Fe, Co, PGE, etc. |
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02.CC.15 Cherepanovite RhAs P nma 2/m 2/m 2/m |
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02.CC.15 Modderite (Co,Fe)As Pmcn 2/m 2/m 2/m |
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02.CC.15 Ruthenarsenite (Ru,Ni)As P nma 2/m 2/m 2/m |
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02.CC.15 Westerveldite (Fe,Ni,Co)As Pnam 2/m 2/m 2/m |
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Other Westerveldite Information
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| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Westerveldite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Westerveldite
(Fe,Ni,Co)As
Dana No: 02.08.19.01 Strunz No: 02.CC.15
Locality:
Notes:
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