Westerveldite Mineral Data

Westerveldite Mineral Data +

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General Westerveldite Information

Chemical Formula:

(Fe,Ni,Co)As

Composition:

Molecular Weight = 131.93 gm

Iron 25.40 % Fe

Cobalt 4.47 % Co

Nickel 13.35 % Ni

Arsenic 56.79 % As

______

100.00 %

Empirical Formula:

Fe²⁺_0.6Ni_0.3Co_0.1As

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 Ojén, Marbella Province, Málaga, 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.

Synonym:

ICSD 30413

PDF 12-799

Westerveldite Image

Images:

Westerveldite

Comments: Silvery metallic westerveldite grains in syenite rock.
Location: Ilimaussaq, Greenland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Westerveldite Crystallography

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 - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnam

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

By Intensity(I/I_o): 2.604(1), 1.988(0.5), 2.083(0.25),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Lyman P S , Prewitt C T , Acta Crystallographica, Section B , 40 (1984) p.14-20, Room- and high-pressure crystal chemistry of CoAs and FeAs, Locality: synthetic, Note: anisoB s taken from ICSD

View Additional jPOWD Structure files for Westerveldite
[1] [2] [3] [4] [5] [6]

Physical Properties of Westerveldite

Color:

Brownish white, Gray.

Diaphaniety:

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

Optical Properties of Westerveldite

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	∑ R₁(λ)	∑ R₂(λ)
400 nm	46.90	48.60
420 nm	46.30	48.50
440 nm	45.70	48.40
460 nm	44.90	48.00
480 nm	44.30	48.00
500 nm	43.70	47.80
520 nm	43.40	47.90
540 nm	43.40	47.90
560 nm	43.40	48.00
580 nm	43.50	48.00
600 nm	43.70	48.10
620 nm	44.10	48.30
640 nm	44.40	48.60
660 nm	44.90	48.90
680 nm	45.60	49.10
700 nm	46.20	49.40

**Calculated Relative Intensity Colors of Westerveldite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%
R₁
R₂

Calculated Properties of Westerveldite

Electron Density:

r_electron=7.20 gm/cc
note: r_{Westerveldite}=7.96 gm/cc.

Fermion Index

Fermion Index = 0.00689
Boson Index = 0.99311

Photoelectric:

PE_{Westerveldite}= 55.89 barns/electron
U=PE_{Westerveldite} x r_electron= 402.62 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Westerveldite is Not Radioactive

Westerveldite Classification

Dana Class:

2.8.19.1 (2)Sulfides - Including Selenides and Tellurides

(2.8)where Am Bn Xp, with (m+n):p=1:1

(2.8.19)Dana Group

2.8.19.1 Westerveldite (Fe,Ni,Co)As Pnam 2/m 2/m 2/m

Strunz Class:

II/C.19-30 II - Sulfides and sulphosalts

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.19 - Troilite - Pyrrhotite - Haideite series

II/C.19-10 Troilite FeS P 6₃/mmc 6/m 2/m 2/m

II/C.19-20 Pyrrhotite Fe(1-x)S(x=0-0.17) A2/a 2/m

II/C.19-25 Jaipurite* CoS P 6₃/mmc 6/m 2/m 2/m

II/C.19-30 Westerveldite (Fe,Ni,Co)As Pnam 2/m 2/m 2/m

II/C.19-40 Modderite (Co,Fe)As Pmcn 2/m 2/m 2/m

II/C.19-50 Smythite (Fe,Ni)9S11or(Fe,Ni)13S16 R 3m 3 2/m

II/C.19-60 Achavalite* FeSe P 6₃/mmc 6/m 2/m 2/m

II/C.19-70 Heideite (Fe,Cr)1x(Ti,Fe)2S4 I2/m 2/m

Other Westerveldite Information

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Westerveldite

(Fe,Ni,Co)As
Dana No: 2.8.19.1 Strunz No: II/C.19-30
Locality:

Notes: