Cherepanovite Mineral Data

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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

Diaphaneity:

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:

Bulk Density (Electron Density)=8.44 gm/cc
note: Specific Gravity of Cherepanovite =9.62 gm/cc.

Fermion Index:

Fermion Index = 0
Boson Index = 1

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cherepanovite is Not Radioactive

Cherepanovite Classification

Dana Class:

02.08.17.02 (02)Sulfides - Including Selenides and Tellurides

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

(02.08.17)Dana Group

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

02.08.17.02 Cherepanovite RhAs P nma 2/m 2/m 2/m

Strunz Class:

02.CC.15 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.C - Metal Sulfides, M:S = 1:1 (and similar)

02.CC -With Ni, Fe, Co, PGE, etc.

02.CC.15 Cherepanovite RhAs P nma 2/m 2/m 2/m

02.CC.15 Modderite (Co,Fe)As Pmcn 2/m 2/m 2/m

02.CC.15 Ruthenarsenite (Ru,Ni)As P nma 2/m 2/m 2/m

02.CC.15 Westerveldite (Fe,Ni,Co)As Pnam 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 - EUROmin Project
4 - Ecole des Mines de Paris
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 - Ruff.Info

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Cherepanovite

RhAs
Dana No: 02.08.17.02 Strunz No: 02.CC.15
Locality:

Notes: