Penroseite Mineral Data

Penroseite Mineral Data +

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General Penroseite Information

Chemical Formula:

(Ni,Co,Cu)Se2

Composition:

Molecular Weight = 217.17 gm

Cobalt 8.14 % Co

Copper 2.93 % Cu

Nickel 16.22 % Ni

Selenium 72.72 % Se

______

100.00 %

Empirical Formula:

Ni_0.6Co_0.3Cu_0.1Se₂

Environment:

In hydrothermal veins.

IMA Status:

Valid Species (Pre-IMA) 1926

Locality:

Pacajake mine, Hiaco, 30 km east-northeast of Colquechaca, Potosí, 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.

Synonym:

Blockite

ICSD 40330

PDF 41-1495

Penroseite Image

Images:

Penroseite

Comments: Silvery metallic penroseite masses in matrix.
Location: Unnamed prospect in Pacajake Canyon, near Culquechaca, Potosi, Bolivia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Penroseite Crystallography

Cell Dimensions:

a = 5.991, Z = 4; V = 215.03 Den(Calc)= 6.71

Crystal System:

Isometric - DiploidalH-M Symbol (2/m 3) Space Group: P a3

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

By Intensity(I/I_o): 2.45(1), 2.68(1), 1.806(0.9),

Physical Properties of Penroseite

Cleavage:

[001] Perfect, [011] Distinct

Color:

Lead gray, Steel gray.

Density:

6.58 - 6.74, Average = 6.66

Diaphaniety:

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

Optical Properties of Penroseite

RL Color:

Creamy grayish white.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Penroseite in Air**
λ	R	∑ R(λ)
400 nm	39.00
420 nm	39.20
440 nm	39.40
460 nm	39.60
480 nm	40.00
500 nm	40.30
520 nm	40.70
540 nm	41.10
560 nm	41.50
580 nm	42.00
600 nm	42.50
620 nm	43.00
640 nm	43.30
660 nm	43.40
680 nm	43.70
700 nm	44.20

**Calculated Relative Intensity Colors of Penroseite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	230%
R

Calculated Properties of Penroseite

Electron Density:

r_electron=5.92 gm/cc
note: r_Penroseite=6.71 gm/cc.

Fermion Index

Fermion Index = 0.05709
Boson Index = 0.94291

Photoelectric:

PE_Penroseite= 69.37 barns/electron
U=PE_Penroseite x r_electron= 410.66 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Penroseite is Not Radioactive

Penroseite Classification

Dana Class:

2.12.1.4 (2)Sulfides - Including Selenides and Tellurides

(2.12)where Am Bn Xp, with (m+n):p=1:2

(2.12.1)Pyrite Group (Isometric: Pa3)

2.12.1.1 Pyrite FeS2 P a3 2/m 3

2.12.1.2 Vaesite NiS2 P a3 2/m 3

2.12.1.3 Cattierite CoS2 P a3 2/m 3

2.12.1.4 Penroseite (Ni,Co,Cu)Se2 P a3 2/m 3

2.12.1.5 Trogtalite CoSe2 P a3 2/m 3

2.12.1.6 Villamaninite (Cu,Ni,Co,Fe)S2 P a3 2/m 3

2.12.1.7 Fukuchilite Cu3FeS8 P a3 2/m 3

2.12.1.8 Krutaite CuSe2 P a3 2/m 3

2.12.1.9 Hauerite MnS2 P a3 2/m 3

2.12.1.10 Laurite RuS2 P a3 2/m 3

2.12.1.11 Aurostibite AuSb2 P a3 2/m 3

2.12.1.12 Krutovite NiAs2 P a3 2/m 3

2.12.1.13 Sperrylite PtAs2 P a3 2/m 3

2.12.1.14 Geversite Pt(Sb,Bi)2 P a3 2/m 3

2.12.1.15 Insizwaite Pt(Bi,Sb)2 P a3 2/m 3

2.12.1.16 Erlichmanite OsS2 P a3 2/m 3

2.12.1.17 Dzharkenite FeSe2 P a3 2/m 3

2.12.1.18 Gaotaiite Ir3Te8 P a3 2/m 3

2.12.1.19 Mayingite IrBiTe P a3 2/m 3

Strunz Class:

II/D.17-90 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.17 - Pyrite group and related compounds, Fukuchilite - Micherenite

II/D.17-10 Fukuchilite Cu3FeS8 P a3 2/m 3

II/D.17-20 Villamaninite (Cu,Ni,Co,Fe)S2 P a3 2/m 3

II/D.17-30 Pyrite FeS2 P a3 2/m 3

II/D.17-40 Cattierite CoS2 P a3 2/m 3

II/D.17-50 Vaesite NiS2 P a3 2/m 3

II/D.17-60 Hauerite MnS2 P a3 2/m 3

II/D.17-65 Dzharkenite FeSe2 P a3 2/m 3

II/D.17-70 Krutaite CuSe2 P a3 2/m 3

II/D.17-80 Trogtalite CoSe2 P a3 2/m 3

II/D.17-90 Penroseite (Ni,Co,Cu)Se2 P a3 2/m 3

II/D.17-100 Laurite RuS2 P a3 2/m 3

II/D.17-110 Erlichmanite OsS2 P a3 2/m 3

II/D.17-120 Sperrylite PtAs2 P a3 2/m 3

II/D.17-130 Aurostibite AuSb2 P a3 2/m 3

II/D.17-140 Geversite Pt(Sb,Bi)2 P a3 2/m 3

II/D.17-150 Insizwaite Pt(Bi,Sb)2 P a3 2/m 3

II/D.17-153 Changchengite! IrBiS P 2₁3 2 3

II/D.17-155 Mayingite IrBiTe P a3 2/m 3

II/D.17-160 Maslovite PtBiTe P 2₁3 2 3

II/D.17-170 Testibiopalladite PdTe(Sb,Te) P 2₁3 2 3

II/D.17-175 Padmaite PdBiSe P 2₁3 2 3

II/D.17-180 Michenerite (Pd,Pt)BiTe P 2₁3 2 3

Other Penroseite Information

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 -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 - WWW-MINCRYST 13 -École des Mines de Paris

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

Penroseite

(Ni,Co,Cu)Se2
Dana No: 2.12.1.4 Strunz No: II/D.17-90
Locality:

Notes: