Gaotaiite Mineral Data

Gaotaiite Mineral Data +

General Gaotaiite Information

Chemical Formula:

Ir3Te8

Composition:

Molecular Weight = 1,597.46 gm

Tellurium 63.90 % Te

Iridium 36.10 % Ir

______

100.00 %

Empirical Formula:

Ir₃Te₈

Environment:

A constituent of placer deposits and crushed ores of a chromium deposit.

IMA Status:

Approved IMA 1995

Locality:

Near the village of Gaotai, about 200 km NNE of Beijing, People's Republic of China. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Synonym:

IMA1993-017

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Gaotaiite Crystallography

Cell Dimensions:

a = 6.413, Z = 1; V = 263.74 Den(Calc)= 10.06

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): 1.93(1), 1.132(0.9), 1.235(0.8),

Physical Properties of Gaotaiite

Cleavage:

None

Color:

Steel black.

Density:

9.97

Diaphaniety:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

3 - Calcite

Luster:

Metallic

Streak:

black

Optical Properties of Gaotaiite

RL Anisotrophism:

Weak with bluish or yellowish tint.

RL Bireflectance:

Not noticable.

RL Color:

Bright white with bluish tint.

RL Pleochroism:

Not noticable.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Gaotaiite in Air**
λ	R	∑ R(λ)
470 nm	46.60
546 nm	46.30
589 nm	46.30
650 nm	45.60

**Calculated Relative Intensity Colors of Gaotaiite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	200%
R

Calculated Properties of Gaotaiite

Electron Density:

r_electron=8.15 gm/cc
note: r_Gaotaiite=10.1 gm/cc.

Fermion Index

Fermion Index = 0.05105
Boson Index = 0.94895

Photoelectric:

PE_Gaotaiite= 794.05 barns/electron
U=PE_Gaotaiite x r_electron=6,470.72 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gaotaiite is Not Radioactive

Gaotaiite Classification

Dana Class:

2.12.1.18 (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.29-40 II - Sulfides and sulphosalts

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

II/D.29 - Skutterudite - Iridisite series

II/D.29-10 Skutterudite (Co,Ni)As3-x I m3 2/m 3

II/D.29-20 Nickel-skutterudite (Ni,Co)As3-x I m3 2/m 3

II/D.29-25 Kieftite CoSb3 I m3 2/m 3

II/D.29-30 Iridisite* (Ir,Cu,Rh,Ni,Pt)S2 Unk Cubic

II/D.29-40 Gaotaiite Ir3Te8 P a3 2/m 3

Other Gaotaiite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,1996) OPTIC PROP.(MinRec, v 27, p 117)

See Also:

Links to other databases for Gaotaiite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Gaotaiite

Ir3Te8
Dana No: 2.12.1.18 Strunz No: II/D.29-40
Locality:

Notes: