Sperrylite Mineral Data

Sperrylite Mineral Data +

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General Sperrylite Information

Chemical Formula:

PtAs2

Composition:

Molecular Weight = 344.92 gm

Arsenic 43.44 % As

Platinum 56.56 % Pt

______

100.00 %

Empirical Formula:

PtAs₂

Environment:

Magmatic, in basic pegmatites, and alluvial deposits.

IMA Status:

Valid Species (Pre-IMA) 1889

Locality:

Sudbury, Ontario, Canada. Tweefontein, Republic of South Africa. Link to MinDat.org Location Data.

Name Origin:

Named after its discoverer, the American chemist, Francis L. Sperry of Tallmadge, Ohio, USA..

Synonym:

ICSD 38428

PDF 42-1341

Sperrylite Image

Images:

Sperrylite

Comments: Tin-white grain of sperrylite in chalcopyrite matrix.
Location: Vermillion mine, Sudbury, Ontario, Canada. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Sperrylite

Comments: Brilliant, mirror-like modified octahedral crystals of sperrylite to 1.3 cm on chalcopyrite matrix..
Location: Talnak deposit, near Noril'sk, Russia. Scale: 4.4 x 2.3 x 2cm.
© Tom Loomis / Dakota Matrix

Images:

Sperrylite Cabriite

Comments: Small crystal of dull gray cabriite on a larger tin-white sperrylite crystal.
Location: Dzhezhazgan, Kazakhstan. Scale: Crystal size 1.5 mm.
© John Veevaert

Sperrylite Crystallography

Cell Dimensions:

a = 5.967, Z = 4; V = 212.46 Den(Calc)= 10.78

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): 1.801(1), 1.148(0.7), 2.98(0.6),

Forms:

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Forms: [ 1 0 2] [ 1 1 1] [ 1 0 0]

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Physical Properties of Sperrylite

Cleavage:

[001] Indistinct

Color:

Tin white.

Density:

10.58

Diaphaniety:

Opaque

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Disseminated - Occurs in small, distinct particles dispersed in matrix.

Hardness:

6-7 - Orthoclase-Quartz

Luminescence:

None.

Luster:

Metallic

Magnetism:

Nonmagnetic

Streak:

black

Optical Properties of Sperrylite

RL Pleochroism:

None.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Sperrylite in Air**
λ	R	∑ R(λ)
400 nm	59.40
420 nm	58.20
440 nm	57.00
460 nm	56.20
480 nm	55.70
500 nm	55.40
520 nm	55.20
540 nm	55.20
560 nm	55.20
580 nm	55.20
600 nm	54.90
620 nm	54.40
640 nm	53.70
660 nm	53.20
680 nm	53.00
700 nm	53.40

**Calculated Relative Intensity Colors of Sperrylite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	170%
R

Calculated Properties of Sperrylite

Electron Density:

r_electron=9.00 gm/cc
note: r_Sperrylite=10.8 gm/cc.

Fermion Index

Fermion Index = 0.19116
Boson Index = 0.80884

Photoelectric:

PE_Sperrylite= 910.99 barns/electron
U=PE_Sperrylite x r_electron=8,199.75 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Sperrylite is Not Radioactive

Sperrylite Classification

Dana Class:

2.12.1.13 (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.17-120 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 Sperrylite Information

References:

NAME( Mason68) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

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Sperrylite

PtAs2
Dana No: 2.12.1.13 Strunz No: II/D.17-120
Locality:

Notes: