Orcelite Mineral Data

Orcelite Mineral Data +

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General Orcelite Information

Chemical Formula:

Ni5-xAs2 (x=0.23)

Composition:

Molecular Weight = 429.79 gm

Nickel 65.14 % Ni

Arsenic 34.86 % As

______

100.00 %

Empirical Formula:

Ni_4.77As₂

Environment:

Inclusions in pentlandite in ultramafic rocks.

IMA Status:

Approved IMA 1959

Locality:

Tiebaghi massif, New Caledonia. Link to MinDat.org Location Data.

Name Origin:

Named for Jean Orcel (1896-1978), French mineralogist.

Synonym:

ICSD 15053

PDF 35-493

Orcelite Image

Images:

Orcelite

Comments: Bronze micro spherical orcelite coated with greenish zaratite.
Location: Tiebaghi Massif, New Caledonia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Orcelite Crystallography

Axial Ratios:

a:c = 1:1.84925

Cell Dimensions:

a = 6.7, c = 12.39, Z = 6; V = 481.67 Den(Calc)= 8.89

Crystal System:

Hexagonal - Dihexagonal PyramidalH-M Symbol (6mm) Space Group: P 6₃cm

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

By Intensity(I/I_o): 1.918(1), 1.977(1), 2.11(0.4),

Physical Properties of Orcelite

Color:

Yellow white, Pink bronze.

Density:

7.5

Diaphaniety:

Opaque

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Luster:

Metallic

Optical Properties of Orcelite

RL Anisotrophism:

Noticeable.

RL Color:

Orange white.

RL Pleochroism:

Low, weaker than nickeline.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Orcelite in Air**
λ	R	∑ R(λ)
400 nm	42.30
420 nm	42.90
440 nm	43.60
460 nm	44.50
480 nm	45.50
500 nm	46.70
520 nm	47.80
540 nm	49.10
560 nm	50.50
580 nm	51.80
600 nm	53.30
620 nm	54.70
640 nm	56.00
660 nm	57.20
680 nm	58.20
700 nm	59.00

**Calculated Relative Intensity Colors of Orcelite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	200%
R

Calculated Properties of Orcelite

Electron Density:

r_electron=8.26 gm/cc
note: r_Orcelite=8.89 gm/cc.

Fermion Index

Fermion Index = 0.00736
Boson Index = 0.99264

Photoelectric:

PE_Orcelite= 51.34 barns/electron
U=PE_Orcelite x r_electron= 423.80 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Orcelite is Not Radioactive

Orcelite Classification

Dana Class:

2.3.2.1 (2)Sulfides - Including Selenides and Tellurides

(2.3)where Am Bn Xp, with (m+n):p=5:2

(2.3.2)Dana Group

2.3.2.1 Orcelite Ni5-xAs2(x=0.23) P 6₃cm 6mm

Strunz Class:

II/A.04-20 II - Sulfides and sulphosalts

II/A - Alloys and alloylike compounds, with Copper, Silver, Gold and Nickel

II/A.04 - Dienerite - Maucherite series

II/A.04-10 Dienerite Ni3As I 43d 4 3m

II/A.04-20 Orcelite Ni5-xAs2(x=0.23) P 6₃cm 6mm

II/A.04-30 Maucherite Ni11As8 P 4₁2₁2,P 4₃2₁2 4 2 2

Other Orcelite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Orcelite :
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 -École des Mines de Paris

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

Orcelite

Ni5-xAs2 (x=0.23)
Dana No: 2.3.2.1 Strunz No: II/A.04-20
Locality:

Notes: