Anduoite Mineral Data

Anduoite Mineral Data +

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General Anduoite Information

Chemical Formula:

(Ru,Os)As2

Composition:

Molecular Weight = 273.20 gm

Arsenic 54.85 % As

Osmium 17.41 % Os

Ruthenium 27.75 % Ru

______

100.00 %

Empirical Formula:

Ru_0.75Os_0.25As₂

Environment:

Occurs in a chromium deposit related to augite peridotite and dunite.

IMA Status:

Approved IMA 1979

Locality:

From Anduo, Tibet, China. Link to MinDat.org Location Data.

Name Origin:

For the Chinese locality at Anduo.

Synonym:

ICSD 42738

PDF 33-1144

Anduoite Image

Images:

Anduoite

Comments: Backscattered electron Image of euhedral anduoite crystal enclosed in chromian spinel containing lamellae of ilmenite. Image on left is large view, image on right is detailed view. (CanMin, v 39, p 596).
Location: Chromitite ore, Kapitanov deposit, Ukrainian Shield, Ukraine. Scale: See Image.
© Canadian Mineralogist

Anduoite Crystallography

Axial Ratios:

a:b:c =0.8717:1:0.485

Cell Dimensions:

a = 5.41, b = 6.206, c = 3.01, Z = 2; V = 101.06 Den(Calc)= 8.98

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnnm

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

By Intensity(I/I_o): 1.92(1), 1.095(0.9), 1.501(0.9),

Crystal Structure:

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RuAs2 , Kjekshus A , Rakke T , Andresen A F , Acta Chemica Scandinavica A , 31 (1977) p.253-259, Compounds with the marcasite type crystal structure. XII. Structural data for, RuP2, RuAs2, RuSb2, OsP2, OsAs2, and OsSb2, Locality: synthetic

Physical Properties of Anduoite

Cleavage:

None

Color:

Lead gray.

Diaphaniety:

Opaque

Fracture:

Malleable - Deforms rather than breaking apart with a hammer.

Habit:

Inclusions - Generally found as inclusions in other minerals.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

7 - Quartz

Luster:

Metallic

Streak:

grayish black

Optical Properties of Anduoite

RL Anisotrophism:

Marked in air from brownish yellow to grayish green, pale red to pale green, pronounced in oil.

RL Color:

White with pink tint.

RL Pleochroism:

Noticeable in air, from pinkish grayish white to pinkish white, distinct in oil.

Calculated Properties of Anduoite

Electron Density:

r_electron=7.76 gm/cc
note: r_Anduoite=8.98 gm/cc.

Fermion Index

Fermion Index = 0.11349
Boson Index = 0.88651

Photoelectric:

PE_Anduoite= 336.17 barns/electron
U=PE_Anduoite x r_electron=2,607.78 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Anduoite is Not Radioactive

Anduoite Classification

Dana Class:

2.12.2.8 (2)Sulfides - Including Selenides and Tellurides

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

(2.12.2)Marcasite Group (Orthorhombic: Pnnm)

2.12.2.1 Marcasite FeS2 Pnnm 2/m 2/m 2/m

2.12.2.2 Ferroselite FeSe2 Pnnm 2/m 2/m 2/m

2.12.2.3 Frohbergite FeTe2 Pnnm 2/m 2/m 2/m

2.12.2.4 Hastite CoSe2 Pnnm 2/m 2/m 2/m

2.12.2.5 Mattagamite CoTe2 Pnnm 2/m 2/m 2/m

2.12.2.6 Kullerudite NiSe2 Pnnm 2/m 2/m 2/m

2.12.2.7 Omeiite (Os,Ru)As2 Pnnm 2/m 2/m 2/m

2.12.2.8 Anduoite (Ru,Os)As2 Pnnm 2/m 2/m 2/m

2.12.2.9 Lollingite FeAs2 Pnnm 2/m 2/m 2/m

2.12.2.10 Seinajokite (Fe,Ni)(Sb,As)2 Pnnm 2/m 2/m 2/m

2.12.2.11 Safflorite (Co,Fe)As2 Pnnm 2/m 2/m 2/m

2.12.2.12 Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m

2.12.2.13 Nisbite NiSb2 Pnnm 2/m 2/m 2/m

Strunz Class:

II/D.20-70 II - Sulfides and sulphosalts

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

II/D.20 - Markasite - Iridarsenite series

II/D.20-10 Marcasite FeS2 Pnnm 2/m 2/m 2/m

II/D.20-20 Ferroselite FeSe2 Pnnm 2/m 2/m 2/m

II/D.20-30 Hastite CoSe2 Pnnm 2/m 2/m 2/m

II/D.20-40 Kullerudite NiSe2 Pnnm 2/m 2/m 2/m

II/D.20-50 Frohbergite FeTe2 Pnnm 2/m 2/m 2/m

II/D.20-60 Mattagamite CoTe2 Pnnm 2/m 2/m 2/m

II/D.20-70 Anduoite (Ru,Os)As2 Pnnm 2/m 2/m 2/m

II/D.20-80 Omeiite (Os,Ru)As2 Pnnm 2/m 2/m 2/m

II/D.20-90 Iridarsenite (Ir,Ru)As2 P 2₁/c 2/m

Other Anduoite Information

References:

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

See Also:

Links to other databases for Anduoite :
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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Anduoite

(Ru,Os)As2
Dana No: 2.12.2.8 Strunz No: II/D.20-70
Locality:

Notes: