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Cherepanovite Mineral Data
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General Cherepanovite Information
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 Chemical Formula: |
RhAs |
| Composition: |
Molecular Weight = 177.83 gm |
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Arsenic 42.13 % As |
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Rhodium 57.87 % Rh |
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______ |
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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 |
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PDF 38-407 |
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Cherepanovite Image |
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Images:
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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 |
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Cherepanovite Crystallography
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| 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 - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma |
| X Ray Diffraction: |
By Intensity(I/Io): 3.01(1), 2.1(0.6), 1.771(0.2), |
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Physical Properties of Cherepanovite
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| 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 |
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Optical Properties of Cherepanovite
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| 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 |
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∑ R1(λ) |
∑ R2(λ) |
| 420 nm |
39.20 |
40.50 |
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| 440 nm |
39.60 |
41.00 |
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| 460 nm |
40.30 |
41.90 |
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| 480 nm |
41.00 |
42.90 |
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| 500 nm |
41.90 |
43.80 |
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| 520 nm |
42.70 |
44.70 |
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| 540 nm |
43.60 |
45.50 |
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| 560 nm |
44.10 |
46.10 |
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| 580 nm |
44.50 |
46.60 |
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| 600 nm |
44.90 |
47.10 |
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| 620 nm |
45.10 |
47.30 |
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| 640 nm |
45.20 |
47.40 |
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| 660 nm |
45.30 |
47.60 |
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| 680 nm |
45.50 |
47.60 |
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| 700 nm |
45.40 |
47.60 |
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Calculated Relative Intensity Colors of Cherepanovite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
220% |
| R1 |
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| R2 |
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Calculated Properties of Cherepanovite
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| Electron Density: |
Bulk Density (Electron Density)=8.44 gm/cc
note: Specific Gravity of Cherepanovite =9.62 gm/cc.
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| Fermion Index: |
Fermion Index = 0
Boson Index = 1 |
| Photoelectric: |
PECherepanovite = 159.98 barns/electron
U=PECherepanovite x rElectron Density=1,350.14 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cherepanovite is Not Radioactive |
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Cherepanovite Classification
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| Dana Class: |
02.08.17.02 (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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(02.08.17)Dana Group |
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02.08.17.01 Ruthenarsenite (Ru,Ni)As P nma 2/m 2/m 2/m |
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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 |
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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 Cherepanovite 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 Cherepanovite :
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
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Cherepanovite
RhAs
Dana No: 02.08.17.02 Strunz No: 02.CC.15
Locality:
Notes:
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