General Greigite Information
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Chemical Formula: |
Fe++Fe+++2S4 |
Composition: |
Molecular Weight = 239.96 gm |
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Iron 46.55 % Fe |
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Sulfur 53.45 % S |
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______ |
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100.00 % |
Empirical Formula: |
Fe2+Fe3+S4 |
Environment: |
In part, a biomineral |
IMA Status: |
Approved IMA 1964 |
Locality: |
Kramer - Four Corners area (Drill cores), San Bernardino Co. California. Link to MinDat.org Location Data. |
Name Origin: |
For Dr. Joseph Wilson Grieg (1895-1977). |
Synonym: |
ICSD 42535 |
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Melnikovite |
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PDF 16-713 |
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Search for Greigite Images |
Images:
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Greigite Crystallography
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Cell Dimensions: |
a = 9.868, Z = 8; V = 960.92 Den(Calc)= 3.32 |
Crystal System: |
Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m |
X Ray Diffraction: |
By Intensity(I/Io): 2.98(1), 1.746(0.77), 2.469(0.55), |
Crystal Structure:
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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Help on Above
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Skinner B J , Erd R C , Grimaldi F S , American Mineralogist , 49 (1964) p.543-555
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Physical Properties of Greigite
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Cleavage: |
None |
Color: |
Blue, Blue black, Bronze, Pink. |
Density: |
4.049 |
Diaphaniety: |
Opaque |
Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
Hardness: |
4-4.5 - Between Fluorite and Apatite |
Luster: |
Metallic |
Streak: |
black |
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Optical Properties of Greigite
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RL Color: |
Pale creamy white. |
Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Greigite in Air
| λ |
R |
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∑ R(λ) |
| 400 nm |
28.80 |
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| 420 nm |
28.90 |
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| 440 nm |
29.00 |
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| 460 nm |
29.20 |
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| 480 nm |
29.40 |
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| 500 nm |
29.80 |
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| 520 nm |
30.30 |
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| 540 nm |
30.70 |
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| 560 nm |
31.30 |
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| 580 nm |
31.90 |
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| 600 nm |
32.40 |
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| 620 nm |
33.20 |
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| 640 nm |
33.90 |
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| 660 nm |
34.70 |
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| 680 nm |
35.50 |
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| 700 nm |
36.30 |
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Calculated Relative Intensity Colors of Greigite in Air
Relative Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
310% |
| R |
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Calculated Properties of Greigite
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Electron Density: |
relectron=3.21 gm/cc note: rGreigite =3.32 gm/cc. |
Fermion Index |
Fermion Index = 0.01387 Boson Index = 0.98613 |
Photoelectric: |
PEGreigite = 16.89 barns/electron U=PEGreigite x relectron= 54.23 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Greigite is Not Radioactive |
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Greigite Classification
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Dana Class: |
2.10.1.10 (2)Sulfides - Including Selenides and Tellurides |
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(2.10)where Am Bn Xp, with (m+n):p=3:4 |
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(2.10.1)Linnaeite Group (Isometric: Fd3m) |
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2.10.1.1 Linnaeite CoCo2S4 F d3m 4/m 3 2/m |
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2.10.1.2 Carrollite Cu(Co,Ni)2S4 F d3m 4/m 3 2/m |
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2.10.1.3 Fletcherite Cu(Ni,Co)2S4 F d3m 4/m 3 2/m |
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2.10.1.4 Tyrrellite (Cu,Co,Ni)3Se4 F d3m 4/m 3 2/m |
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2.10.1.5 Bornhardtite CoCo2Se4 F d3m 4/m 3 2/m |
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2.10.1.6 Siegenite (Ni,Co)3S4 F d3m 4/m 3 2/m |
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2.10.1.7 Polydymite NiNi2S4 F d3m 4/m 3 2/m |
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2.10.1.8 Violarite FeNi2S4 F d3m 4/m 3 2/m |
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2.10.1.9 Trustedtite Ni3Se4 F d3m 4/m 3 2/m |
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2.10.1.10 Greigite FeFe2S4 F d3m 4/m 3 2/m |
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2.10.1.11 Daubreelite FeCr2S4 F d3m 4/m 3 2/m |
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2.10.1.12 Indite FeIn2S4 F d3m 4/m 3 2/m |
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2.10.1.13 Kalininite ZnCr2S4 F d3m 4/m 3 2/m |
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2.10.1.14 Florensovite Cu(Cr1.5Sb0.5)S4 F d3m 4/m 3 2/m |
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2.10.1.15 Cuproiridsite CuIr2S4 F d3m 4/m 3 2/m |
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2.10.1.16 Cuprorhodsite CuRh2S4 F d3m 4/m 3 2/m |
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2.10.1.17 Malanite Cu(Pt,Ir)2S4 F d3m 4/m 3 2/m |
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2.10.1.18 Ferrorhodsite (Fe,Cu)(Rh,Ir,Pt)2S4 F d3m 4/m 3 2/m |
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2.10.1.19 Cadmoindite! CdIn2S4 F d3m 4/m 3 2/m |
Strunz Class: |
II/D.01-10 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.01 - Linneite group and related compounds |
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II/D.01-10 Greigite FeFe2S4 F d3m 4/m 3 2/m |
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II/D.01-20 Linnaeite CoCo2S4 F d3m 4/m 3 2/m |
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II/D.01-30 Polydymite NiNi2S4 F d3m 4/m 3 2/m |
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II/D.01-40 Carrollite Cu(Co,Ni)2S4 F d3m 4/m 3 2/m |
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II/D.01-50 Fletcherite Cu(Ni,Co)2S4 F d3m 4/m 3 2/m |
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II/D.01-60 Florensovite Cu(Cr1.5Sb0.5)S4 F d3m 4/m 3 2/m |
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II/D.01-70 Violarite FeNi2S4 F d3m 4/m 3 2/m |
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II/D.01-80 Siegenite (Ni,Co)3S4 F d3m 4/m 3 2/m |
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II/D.01-90 Indite FeIn2S4 F d3m 4/m 3 2/m |
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II/D.01-95 Cadmoindite! CdIn2S4 F d3m 4/m 3 2/m |
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II/D.01-100 Daubreelite FeCr2S4 F d3m 4/m 3 2/m |
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II/D.01-110 Kalininite ZnCr2S4 F d3m 4/m 3 2/m |
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II/D.01-120 Bornhardtite CoCo2Se4 F d3m 4/m 3 2/m |
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II/D.01-130 Trustedtite Ni3Se4 F d3m 4/m 3 2/m |
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II/D.01-140 Tyrrellite (Cu,Co,Ni)3Se4 F d3m 4/m 3 2/m |
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Other Greigite Information
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References: |
NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
See Also: |
Links to other databases for Greigite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 -Am. Min. Crystal Structure Database
4 -Athena
5 - EUROmin Project
6 -Google Images
7 -Google Scholar
8 -Handbook of Mineralogy (UofA)
9 -MinDAT
10 -MinMax(Deutsch)
11 -MinMax(English)
12 -Mineralienatlas (Deutsch)
13 -QUT Mineral Atlas
14 - WWW-MINCRYST
15 -École des Mines de Paris
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Print or Cut-and-Paste your Greigite Specimen Label here :
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Greigite
Fe++Fe+++2S4
Dana No: 2.10.1.10 Strunz No: II/D.01-10
Locality:
Notes:
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