General Moncheite Information
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Chemical Formula: |
(Pt,Pd)(Te,Bi)2 |
Composition: |
Molecular Weight = 468.81 gm |
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Bismuth 22.29 % Bi |
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Tellurium 40.83 % Te |
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Palladium 5.68 % Pd |
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Platinum 31.21 % Pt |
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______ |
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100.00 % |
Empirical Formula: |
Pt0.75Pd0.25Te1.5Bi0.5 |
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. |
Synonym: |
ICSD 41385 |
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PDF 18-977 |
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Moncheite Image |
Images:
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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 |
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Images:
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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 |
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Moncheite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 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
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Wyckoff R W G , Crystal Structures , 1 (1963) p.239-444, Second edition. Interscience Publishers, New York, New York, Note: cadmium iodide structure
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Physical Properties of Moncheite
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Cleavage: |
[0001] Good |
Color: |
Steel gray. |
Density: |
10 |
Diaphaniety: |
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 |
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Optical Properties of Moncheite
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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 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
50.30 |
51.60 |

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| 420 nm |
51.50 |
52.60 |

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| 440 nm |
52.40 |
53.50 |

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| 460 nm |
53.40 |
54.40 |

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| 480 nm |
54.20 |
55.10 |

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| 500 nm |
54.90 |
55.80 |

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| 520 nm |
55.50 |
56.40 |

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| 540 nm |
56.00 |
56.90 |

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| 560 nm |
56.40 |
57.30 |

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| 580 nm |
56.70 |
57.60 |

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| 600 nm |
57.10 |
58.00 |

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| 620 nm |
57.40 |
58.40 |

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| 640 nm |
57.70 |
58.70 |

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| 660 nm |
58.00 |
59.00 |

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| 680 nm |
58.30 |
59.20 |

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| 700 nm |
58.40 |
59.40 |

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Calculated Relative Intensity Colors of Moncheite in Air
Relative Intensity |
0% |
20% |
40% |
60% |
80% |
100% |
120% |
140% |
160% |
170% |
| R1 |
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| R2 |
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Calculated Properties of Moncheite
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Electron Density: |
relectron=8.38 gm/cc note: rMoncheite =10.4 gm/cc. |
Fermion Index |
Fermion Index = 0.15078 Boson Index = 0.84922 |
Photoelectric: |
PEMoncheite =1,113.32 barns/electron U=PEMoncheite x relectron=9,333.51 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Moncheite is Not Radioactive |
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Moncheite Classification
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Dana Class: |
2.12.14.3 (2)Sulfides - Including Selenides and Tellurides |
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(2.12)where Am Bn Xp, with (m+n):p=1:2 |
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(2.12.14)Melonite Group (Trigonal: P3¯m1) AX2 type |
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2.12.14.1 Melonite NiTe2 P 3m1 3 2/m |
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2.12.14.2 Kitkaite NiTeSe P 3m1 3 2/m |
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2.12.14.3 Moncheite (Pt,Pd)(Te,Bi)2 P 3m1 3 2/m |
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2.12.14.4 Merenskyite (Pd,Pt)(Te,Bi)2 P 3m1 3m |
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2.12.14.5 Berndtite SnS2 P 3m1 3 2/m |
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2.12.14.6 Shuangfengite IrTe2 P 3m1 3 2/m |
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2.12.14.7 Sudovikovite! PtSe2 P 3m1 3 2/m |
Strunz Class: |
II/D.28-50 II - Sulfides and sulphosalts |
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II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold |
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II/D.28 - Melonite group, Berntdtite - Moncheite series |
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II/D.28-10 Berndtite SnS2 P 3m1 3 2/m |
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II/D.28-20 Kitkaite NiTeSe P 3m1 3 2/m |
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II/D.28-30 Melonite NiTe2 P 3m1 3 2/m |
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II/D.28-35 Sudovikovite! PtSe2 P 3m1 3 2/m |
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II/D.28-40 Merenskyite (Pd,Pt)(Te,Bi)2 P 3m1 3m |
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II/D.28-45 Shuangfengite IrTe2 P 3m1 3 2/m |
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II/D.28-50 Moncheite (Pt,Pd)(Te,Bi)2 P 3m1 3 2/m |
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II/D.28-60 Verbeekite! PdSe2 C 2, Cm, or C 2/m Mono |
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Other Moncheite Information
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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 -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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Moncheite
(Pt,Pd)(Te,Bi)2
Dana No: 2.12.14.3 Strunz No: II/D.28-50
Locality:
Notes:
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