Modderite Mineral Data + 
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- 2.8.18.1 Modderite (Co,Fe)As Pmcn 2/m 2/m 2/m
- II/C.19-10 Troilite FeS P 63/mmc 6/m 2/m 2/m
- II/C.19-20 Pyrrhotite Fe(1-x)S(x=0-0.17) A2/a 2/m
- II/C.19-25 Jaipurite* CoS P 63/mmc 6/m 2/m 2/m
- II/C.19-30 Westerveldite (Fe,Ni,Co)As Pnam 2/m 2/m 2/m
- II/C.19-40 Modderite (Co,Fe)As Pmcn 2/m 2/m 2/m
- II/C.19-50 Smythite (Fe,Ni)9S11or(Fe,Ni)13S16 R 3m 3 2/m
- II/C.19-60 Achavalite* FeSe P 63/mmc 6/m 2/m 2/m
- II/C.19-70 Heideite (Fe,Cr)1x(Ti,Fe)2S4 I2/m 2/m
General Modderite Information |
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 Chemical Formula: |
(Co,Fe)As | ||
| Composition: |
Molecular Weight = 133.08 gm | ||
| Iron 10.49 % Fe | |||
| Cobalt 33.21 % Co | |||
| Arsenic 56.30 % As | |||
| ______ | |||
| 100.00 % | |||
| Empirical Formula: |
Co0.75Fe2+0.25As | ||
| Environment: |
In heavy mineral concentrates. | ||
| IMA Status: |
Valid Species (Pre-IMA) 1924 | ||
| Locality: |
Modderfontein mine, Witwatersrand, Transvaal, South Africa. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for the locality. | ||
| Synonym: |
ICSD 48026 | ||
| PDF Sep-94 | |||
Modderite Image | |||
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Images:
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Modderite Crystallography |
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| Axial Ratios: |
a:b:c =0.5891:1:0.9016 | ||
| Cell Dimensions: |
a = 3.458, b = 5.869, c = 5.292, Z = 4; V = 107.40 Den(Calc)= 8.23 | ||
| Crystal System: |
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmcn | ||
| X Ray Diffraction: |
By Intensity(I/Io): 12.1(1), 2.46(0.9), 4.48(0.8), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Modderite |
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| Color: |
Bluish white, Steel gray. | ||
| Diaphaniety: |
Opaque | ||
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. | ||
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. | ||
| Hardness: |
4 - Fluorite | ||
| Luster: |
Metallic | ||
| Streak: |
gray | ||
Calculated Properties of Modderite |
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| Electron Density: |
relectron=7.39 gm/cc |
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| Fermion Index |
Fermion Index = 0.00222 Boson Index = 0.99778 |
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| Photoelectric: |
PEModderite = 55.86 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Modderite is Not Radioactive |
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Modderite Classification |
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| Dana Class: |
2.8.18.1 (2)Sulfides - Including Selenides and Tellurides | ||
| (2.8)where Am Bn Xp, with (m+n):p=1:1 | |||
| (2.8.18)Dana Group | |||
| Strunz Class: |
II/C.19-40 II - Sulfides and sulphosalts | ||
| II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1 | |||
| II/C.19 - Troilite - Pyrrhotite - Haideite series | |||
Other Modderite Information |
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| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Modderite : 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 Search for Modderite using: Visit our Advertisers for Modderite : AA Mineral SpecimensB & L Fine Minerals Crystal Vaults Dan Weinrich Fine Minerals Dan Weinrich Auctions e-Rocks Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals Rockshop.cz T G Fine Minerals Wrights Rock Shop Translate Modderite Mineral Data : Ask about Modderite here : Print or Cut-and-Paste your Modderite Specimen Label here :
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