Moncheite Mineral Data

General Moncheite Information

Chemical Formula:

(Pt,Pd)(Te,Bi)2

Composition:

Molecular Weight = 468.81 gm

Bismuth 22.29 % Bi

Tellurium 40.83 % Te

Palladium 5.68 % Pd

Platinum 31.21 % Pt

______

100.00 %

Empirical Formula:

Pt_0.75Pd_0.25Te_1.5Bi_0.5

Environment:

As grains in chalcopyrite, also overgrowing merenskyite.

IMA Status:

Approved IMA 1963

Locality:

Monchegorsk deposit, Monche Tundra, Murmansk,Kola peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Moncheite + Pronunciation

Synonym:

ICSD 41385

PDF 18-977

Moncheite Image

Images:

Moncheite Chalcopyrite

Comments: White moncheite with chalcopyrite (orange, blue and violet tarnishing colors) in silicate matrix. Polished section (from microprobe analysis) in reflected light.
Location: Lukkulaisvaara ultrabasic Massif, Olanga (Oulanka) River, Oulanka plutonic complex, Karelia Republic, Northern Region, Russia. Scale: Picture size 0.11 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Moncheite Insizwaite

Comments: Back-scattered electron image showing b) intergrowth of taimyrite-tatyanaite with moncheitei-insizwaite (CanMin, v 42, p 611).
Location: Kondyor PGE placer, Khabarovskiy Kray, eastern Siberia, Russia. Scale: See Image.
© Canadian Mineralogist

Moncheite Crystallography

Axial Ratios:

a:c = 1:1.306

Cell Dimensions:

a = 4.049, c = 5.288, Z = 1; V = 75.08 Den(Calc)= 10.37

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: P 3m1

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

By Intensity(I/I_o): 2.93(1), 2.11(0.8), 2.02(0.7),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Wyckoff R W G , Crystal Structures , 1 (1963) p.239-444, Second edition. Interscience Publishers, New York, New York, Note: cadmium iodide structure

Physical Properties of Moncheite

Cleavage:

{0001} Good

Color:

Steel gray.

Density:

Diaphaneity:

Opaque

Habit:

Inclusions - Generally found as inclusions in other minerals.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

2-3 - Gypsum-Calcite

Luster:

Metallic

Streak:

gray

Optical Properties of Moncheite

RL Anisotrophism:

Strong, except in basal sections.

RL Color:

White.

RL Pleochroism:

Weak in air, distinct in oil.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Moncheite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	50.30	51.60
420 nm	51.50	52.60
440 nm	52.40	53.50
460 nm	53.40	54.40
480 nm	54.20	55.10
500 nm	54.90	55.80
520 nm	55.50	56.40
540 nm	56.00	56.90
560 nm	56.40	57.30
580 nm	56.70	57.60
600 nm	57.10	58.00
620 nm	57.40	58.40
640 nm	57.70	58.70
660 nm	58.00	59.00
680 nm	58.30	59.20
700 nm	58.40	59.40

**Calculated Relative Intensity Colors of Moncheite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	170%
R₁
R₂

Calculated Properties of Moncheite

Electron Density:

Bulk Density (Electron Density)=8.38 gm/cc
note: Specific Gravity of Moncheite =10.4 gm/cc.

Fermion Index:

Fermion Index = 0.15
Boson Index = 0.85

Photoelectric:

PE_Moncheite=1,113.32 barns/electron
U=PE_Moncheite x rElectron Density=9,333.51 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Moncheite is Not Radioactive

Moncheite Classification

Dana Class:

02.12.14.03 (02)Sulfides - Including Selenides and Tellurides

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

(02.12.14)Melonite Group (Trigonal: P-3m1) AX2 type

02.12.14.01 Melonite NiTe2 P 3m1 3 2/m

02.12.14.02 Kitkaite NiTeSe P 3m1 3 2/m

02.12.14.03 Moncheite (Pt,Pd)(Te,Bi)2 P 3m1 3 2/m

02.12.14.04 Merenskyite (Pd,Pt)(Te,Bi)2 P 3m1 3m

02.12.14.05 Berndtite SnS2 P 3m1 3 2/m

02.12.14.06 Shuangfengite IrTe2 P 3m1 3 2/m

02.12.14.07 Sudovikovite! PtSe2 P 3m1 3 2/m

Strunz Class:

02.EA.20 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.E - Metal Sulfides, M:S £ 1:2

02.EA -M:S = 1:2

02.EA.20 Berndtite SnS2 P 3m1 3 2/m

02.EA.20 Merenskyite (Pd,Pt)(Te,Bi)2 P 3m1 3m

02.EA.20 Melonite NiTe2 P 3m1 3 2/m

02.EA.20 Kitkaite NiTeSe P 3m1 3 2/m

02.EA.20 Moncheite (Pt,Pd)(Te,Bi)2 P 3m1 3 2/m

02.EA.20 Sudovikovite! PtSe2 P 3m1 3 2/m

02.EA.20 Shuangfengite IrTe2 P 3m1 3 2/m

Other Moncheite Information

References:

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

See Also:

Links to other databases for Moncheite :
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 Moncheite Specimen Label here :

Moncheite

(Pt,Pd)(Te,Bi)2
Dana No: 02.12.14.03 Strunz No: 02.EA.20
Locality:

Notes: