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Modderite Mineral Data
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General Modderite Information
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 Chemical Formula: |
(Co,Fe)As |
| Composition: |
Molecular Weight = 133.08 gm |
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Iron 10.49 % Fe |
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Cobalt 33.21 % Co |
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Arsenic 56.30 % As |
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______ |
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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. |
| Name Pronunciation: |
Modderite + Pronunciation  |
| Synonym: |
ICSD 48026 |
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PDF Sep-94 |
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Modderite Image |
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Images:
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Modderite
Comments: Synthetic crystal of modderite grown for study of this extremely rare mineral.
Location: None, grown in a laboratory.
Scale: Grain size 100 µ-m.
© Katie Phillips / Vassar College |
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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 - Dipyramidal H-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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Physical Properties of Modderite
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| Color: |
Bluish white, Steel gray. |
| Diaphaneity: |
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 |
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Calculated Properties of Modderite
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| Electron Density: |
Bulk Density (Electron Density)=7.39 gm/cc
note: Specific Gravity of Modderite =8.23 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0022240898
Boson Index = 0.9977759102 |
| Photoelectric: |
PEModderite = 55.86 barns/electron
U=PEModderite x rElectron Density= 412.81 barns/cc.
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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: |
02.08.18.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.08)where Am Bn Xp, with (m+n):p=1:1 |
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(02.08.18)Dana Group |
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02.08.18.01 Modderite (Co,Fe)As Pmcn 2/m 2/m 2/m |
| Strunz Class: |
02.CC.15 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.C - Metal Sulfides, M:S = 1:1 (and similar) |
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02.CC -With Ni, Fe, Co, PGE, etc. |
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02.CC.15 Cherepanovite RhAs P nma 2/m 2/m 2/m |
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02.CC.15 Modderite (Co,Fe)As Pmcn 2/m 2/m 2/m |
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02.CC.15 Ruthenarsenite (Ru,Ni)As P nma 2/m 2/m 2/m |
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02.CC.15 Westerveldite (Fe,Ni,Co)As Pnam 2/m 2/m 2/m |
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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 - 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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Modderite
(Co,Fe)As
Dana No: 02.08.18.01 Strunz No: 02.CC.15
Locality:
Notes:
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