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Penroseite Mineral Data
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General Penroseite Information
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 Chemical Formula: |
(Ni,Co,Cu)Se2 |
| Composition: |
Molecular Weight = 217.17 gm |
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Cobalt 8.14 % Co |
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Copper 2.93 % Cu |
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Nickel 16.22 % Ni |
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Selenium 72.72 % Se |
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______ |
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100.00 % |
| Empirical Formula: |
Ni0.6Co0.3Cu0.1Se2 |
| Environment: |
In hydrothermal veins. |
| IMA Status: |
Valid Species (Pre-IMA) 1926 |
| Locality: |
Pacajake mine, Hiaco, 30 km east-northeast of Colquechaca, Potos�, Bolivia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Richard Alexander Fullerton Penrose, Jr. (1863-1931), American economic geologist, of Philaelphia, Pennsylvania, USA. |
| Name Pronunciation: |
Penroseite + Pronunciation  |
| Synonym: |
Blockite |
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ICSD 40330 |
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PDF 41-1495 |
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Penroseite Image |
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Images:
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Images:
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Kitkaite Penroseite Sederholmite
Comments: B&W polished section image showing kitkaite replacing calcite in penroseite, clausthalite and sederholmite. Note the absence of the clausthalite envelope around kitkaite..
Location: Valley of the Kitka river in Kuusamo, northeast Finland. (AmMin, v50:581).
Scale: 100 X.
© American Mineralogist |
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Penroseite Crystallography
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| Cell Dimensions: |
a = 5.991, Z = 4; V = 215.03 Den(Calc)= 6.71 |
| Crystal System: |
Isometric - Diploidal H-M Symbol (2/m 3) Space Group: P a3 |
| X Ray Diffraction: |
By Intensity(I/Io): 2.45(1), 2.68(1), 1.806(0.9), |
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Physical Properties of Penroseite
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| Cleavage: |
{001} Perfect, {011} Distinct |
| Color: |
Lead gray, Steel gray. |
| Density: |
6.58 - 6.74, Average = 6.66 |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Habit: |
Columnar - Forms columns |
| Habit: |
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite) |
| Habit: |
Reniform - "Kidney like" in shape (e.g.. hematite). |
| Hardness: |
2.5-3 - Finger Nail-Calcite |
| Luster: |
Metallic |
| Streak: |
black |
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Optical Properties of Penroseite
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| RL Color: |
Creamy grayish white. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Penroseite in Air
| λ |
R |
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∑ R(λ) |
| 400 nm |
39.00 |
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| 420 nm |
39.20 |
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| 440 nm |
39.40 |
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| 460 nm |
39.60 |
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| 480 nm |
40.00 |
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| 500 nm |
40.30 |
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| 520 nm |
40.70 |
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| 540 nm |
41.10 |
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| 560 nm |
41.50 |
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| 580 nm |
42.00 |
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| 600 nm |
42.50 |
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| 620 nm |
43.00 |
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| 640 nm |
43.30 |
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| 660 nm |
43.40 |
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| 680 nm |
43.70 |
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| 700 nm |
44.20 |
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Calculated Relative Intensity Colors of Penroseite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
230% |
| R |
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Calculated Properties of Penroseite
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| Electron Density: |
Bulk Density (Electron Density)=5.92 gm/cc
note: Specific Gravity of Penroseite =6.71 gm/cc.
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| Fermion Index: |
Fermion Index = 0.05
Boson Index = 0.95 |
| Photoelectric: |
PEPenroseite = 69.37 barns/electron
U=PEPenroseite x rElectron Density= 410.66 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Penroseite is Not Radioactive |
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Penroseite Classification
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| Dana Class: |
02.12.01.04 (02)Sulfides - Including Selenides and Tellurides |
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(02.12)where Am Bn Xp, with (m+n):p=1:2 |
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(02.12.01)Pyrite Group (Isometric: Pa3) |
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02.12.01.01 Pyrite FeS2 P a3 2/m 3 |
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02.12.01.02 Vaesite NiS2 P a3 2/m 3 |
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02.12.01.03 Cattierite CoS2 P a3 2/m 3 |
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02.12.01.04 Penroseite (Ni,Co,Cu)Se2 P a3 2/m 3 |
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02.12.01.05 Trogtalite CoSe2 P a3 2/m 3 |
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02.12.01.06 Villamaninite (Cu,Ni,Co,Fe)S2 P a3 2/m 3 |
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02.12.01.07 Fukuchilite Cu3FeS8 P a3 2/m 3 |
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02.12.01.08 Krutaite CuSe2 P a3 2/m 3 |
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02.12.01.09 Hauerite MnS2 P a3 2/m 3 |
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02.12.01.10 Laurite RuS2 P a3 2/m 3 |
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02.12.01.11 Aurostibite AuSb2 P a3 2/m 3 |
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02.12.01.12 Krutovite NiAs2 P a3 2/m 3 |
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02.12.01.13 Sperrylite PtAs2 P a3 2/m 3 |
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02.12.01.14 Geversite Pt(Sb,Bi)2 P a3 2/m 3 |
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02.12.01.15 Insizwaite Pt(Bi,Sb)2 P a3 2/m 3 |
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02.12.01.16 Erlichmanite OsS2 P a3 2/m 3 |
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02.12.01.17 Dzharkenite FeSe2 P a3 2/m 3 |
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02.12.01.18 Gaotaiite Ir3Te8 P a3 2/m 3 |
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02.12.01.19 Mayingite IrBiTe P a3 2/m 3 |
| Strunz Class: |
02.EB.05a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.E - Metal Sulfides, M:S � 1:2 |
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02.EB -M:S = 1:2, with Fe, Co, Ni, PGE, etc. |
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02.EB.05a Aurostibite AuSb2 P a3 2/m 3 |
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02.EB.05a Cattierite CoS2 P a3 2/m 3 |
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02.EB.05a Hauerite MnS2 P a3 2/m 3 |
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02.EB.05a Fukuchilite Cu3FeS8 P a3 2/m 3 |
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02.EB.05a Dzharkenite FeSe2 P a3 2/m 3 |
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02.EB.05a Erlichmanite OsS2 P a3 2/m 3 |
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02.EB.05a Geversite Pt(Sb,Bi)2 P a3 2/m 3 |
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02.EB.05a Gaotaiite Ir3Te8 P a3 2/m 3 |
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02.EB.05a Insizwaite Pt(Bi,Sb)2 P a3 2/m 3 |
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02.EB.05a Laurite RuS2 P a3 2/m 3 |
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02.EB.05a Krutaite CuSe2 P a3 2/m 3 |
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02.EB.05a Pyrite FeS2 P a3 2/m 3 |
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02.EB.05a Penroseite (Ni,Co,Cu)Se2 P a3 2/m 3 |
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02.EB.05a Sperrylite PtAs2 P a3 2/m 3 |
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02.EB.05a Vaesite NiS2 P a3 2/m 3 |
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02.EB.05a Villamaninite (Cu,Ni,Co,Fe)S2 P a3 2/m 3 |
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02.EB.05a Trogtalite CoSe2 P a3 2/m 3 |
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Other Penroseite 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 Penroseite :
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
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Penroseite Specimen Label here :
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Penroseite
(Ni,Co,Cu)Se2
Dana No: 02.12.01.04 Strunz No: 02.EB.05a
Locality:
Notes:
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