Cherepanovite Mineral Data

Cherepanovite Mineral Data

General Cherepanovite Information

Chemical Formula:

RhAs

Composition:

Molecular Weight = 177.83 gm

Arsenic 42.13 % As

Rhodium 57.87 % Rh

______

100.00 %

Empirical Formula:

RhAs

Environment:

In a placer with other platinum group element minerals derived from an ultramafic massif in an ophiolite belt.

IMA Status:

Approved IMA 1985

Locality:

From an undefined locality in the Koryak-Kamchatka region, northeastern USSR. Link to MinDat.org Location Data.

Name Origin:

For V.A. Cherepanov (1927-1983), geologist and mineralogist.

Synonym:

ICSD 42472

PDF 38-407

Cherepanovite Image

Images:

Click Here for Larger Cherepanovite Image

Cherepanovite Cooperite Platinum

Comments: Creamy-grayish fractured grains of cherepanovite with gray granular cooperite and white massive grains of iridian ruthenian platinum. Polished section in reflected light.
Location: Placer Deposit, Northern Pekul'nei River, Pekul'nei Range, Chukotka (Tchukotka) Okrug, Chukot Peninsula, Far-Eastern Region, Russia. Scale: Picture size 0.12 mm.
© Thomas Witzke / Abraxas-Verlag

Cherepanovite Crystallography

Axial Ratios:

a:b:c =1.5877:1:1.6713

Cell Dimensions:

a = 5.7, b = 3.59, c = 6, Z = 4; V = 122.78 Den(Calc)= 9.62

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma

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

By Intensity(I/I_o): 3.01(1), 2.1(0.6), 1.771(0.2),

Physical Properties of Cherepanovite

Color:

Grayish black, Black.

Density:

9.72

Diaphaniety:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

6 - Orthoclase

Luster:

Metallic

Streak:

black

Optical Properties of Cherepanovite

RL Anisotrophism:

Green to gray-brown.

RL Color:

White with orange tint.

RL Pleochroism:

Weak, in yellow to pinkish hue and bluish white.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Cherepanovite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
420 nm	39.20	40.50
440 nm	39.60	41.00
460 nm	40.30	41.90
480 nm	41.00	42.90
500 nm	41.90	43.80
520 nm	42.70	44.70
540 nm	43.60	45.50
560 nm	44.10	46.10
580 nm	44.50	46.60
600 nm	44.90	47.10
620 nm	45.10	47.30
640 nm	45.20	47.40
660 nm	45.30	47.60
680 nm	45.50	47.60
700 nm	45.40	47.60

**Calculated Relative Intensity Colors of Cherepanovite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	220%
R₁
R₂

Calculated Properties of Cherepanovite

Electron Density:

r_electron=8.44 gm/cc
note: r_{Cherepanovite}=9.62 gm/cc.

Fermion Index

Fermion Index = 0
Boson Index = 1

Photoelectric:

PE_{Cherepanovite}= 159.98 barns/electron
U=PE_{Cherepanovite} x r_electron=1,350.14 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Cherepanovite is Not Radioactive

Cherepanovite Classification

Dana Class:

2.8.17.2 (2)Sulfides - Including Selenides and Tellurides

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

(2.8.17)Dana Group

2.8.17.1 Ruthenarsenite (Ru,Ni)As P nma 2/m 2/m 2/m

2.8.17.2 Cherepanovite RhAs P nma 2/m 2/m 2/m

Strunz Class:

II/C.20-130 II - Sulfides and sulphosalts

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

II/C.20 - Nickeline group and related compounds, Polarite - Cherepanovite series

II/C.20-05 Sorosite! Cu(Sn,Sb) P 6₃/mmc 6/m 2/m 2/m

II/C.20-10 Langisite (Co,Ni)As P 6₃/mmc 6/m 2/m 2/m

II/C.20-20 Nickeline NiAs P 6₃/mmc 6/m 2/m 2/m

II/C.20-30 Breithauptite NiSb P 6₃/mmc 6/m 2/m 2/m

II/C.20-40 Freboldite CoSe P 6₃/mmc 6/m 2/m 2/m

II/C.20-50 Sederholmite NiSe P 6₃/mmc 6/m 2/m 2/m

II/C.20-70 Hexatestibiopanickelite (Ni,Pd)(Te,Sb) P 6₃/mmc 6/m 2/m 2/m

II/C.20-75 Yuanjiangite AuSn P 6₃/mmc 6/m 2/m 2/m

II/C.20-80 Kotulskite Pd(Te,Bi) P 6₃/mmc 6/m 2/m 2/m

II/C.20-90 Sudburyite (Pd,Ni)Sb P 6₃/mmc 6/m 2/m 2/m

II/C.20-95 Stumpflite Pt(Sb,Bi) P 6₃/mmc 6/m 2/m 2/m

II/C.20-100 Polarite Pd(Bi,Pb) Ccm21 mm2

II/C.20-110 Sobolevskite PdBi P 6₃/mmc 6/m 2/m 2/m

II/C.20-120 Ruthenarsenite (Ru,Ni)As P nma 2/m 2/m 2/m

II/C.20-130 Cherepanovite RhAs P nma 2/m 2/m 2/m

Other Cherepanovite Information

References:

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

See Also:

Links to other databases for Cherepanovite :
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 (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Cherepanovite

RhAs
Dana No: 2.8.17.2 Strunz No: II/C.20-130
Locality:

Notes: