Greigite Mineral Data

Greigite Mineral Data +

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General Greigite Information

Chemical Formula:

Fe++Fe+++2S4

Composition:

Molecular Weight = 239.96 gm

Iron 46.55 % Fe

Sulfur 53.45 % S

______

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

Melnikovite

PDF 16-713

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Greigite Crystallography

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

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

By Intensity(I/I_o): 2.98(1), 1.746(0.77), 2.469(0.55),

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

Skinner B J , Erd R C , Grimaldi F S , American Mineralogist , 49 (1964) p.543-555

Physical Properties of Greigite

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

Optical Properties of Greigite

RL Color:

Pale creamy white.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Greigite in Air**
λ	R	∑ R(λ)
400 nm	28.80
420 nm	28.90
440 nm	29.00
460 nm	29.20
480 nm	29.40
500 nm	29.80
520 nm	30.30
540 nm	30.70
560 nm	31.30
580 nm	31.90
600 nm	32.40
620 nm	33.20
640 nm	33.90
660 nm	34.70
680 nm	35.50
700 nm	36.30

**Calculated Relative Intensity Colors of Greigite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	310%
R

Calculated Properties of Greigite

Electron Density:

r_electron=3.21 gm/cc
note: r_Greigite=3.32 gm/cc.

Fermion Index

Fermion Index = 0.01387
Boson Index = 0.98613

Photoelectric:

PE_Greigite= 16.89 barns/electron
U=PE_Greigite x r_electron= 54.23 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Greigite is Not Radioactive

Greigite Classification

Dana Class:

2.10.1.10 (2)Sulfides - Including Selenides and Tellurides

(2.10)where Am Bn Xp, with (m+n):p=3:4

(2.10.1)Linnaeite Group (Isometric: Fd3m)

2.10.1.1 Linnaeite CoCo2S4 F d3m 4/m 3 2/m

2.10.1.2 Carrollite Cu(Co,Ni)2S4 F d3m 4/m 3 2/m

2.10.1.3 Fletcherite Cu(Ni,Co)2S4 F d3m 4/m 3 2/m

2.10.1.4 Tyrrellite (Cu,Co,Ni)3Se4 F d3m 4/m 3 2/m

2.10.1.5 Bornhardtite CoCo2Se4 F d3m 4/m 3 2/m

2.10.1.6 Siegenite (Ni,Co)3S4 F d3m 4/m 3 2/m

2.10.1.7 Polydymite NiNi2S4 F d3m 4/m 3 2/m

2.10.1.8 Violarite FeNi2S4 F d3m 4/m 3 2/m

2.10.1.9 Trustedtite Ni3Se4 F d3m 4/m 3 2/m

2.10.1.10 Greigite FeFe2S4 F d3m 4/m 3 2/m

2.10.1.11 Daubreelite FeCr2S4 F d3m 4/m 3 2/m

2.10.1.12 Indite FeIn2S4 F d3m 4/m 3 2/m

2.10.1.13 Kalininite ZnCr2S4 F d3m 4/m 3 2/m

2.10.1.14 Florensovite Cu(Cr1.5Sb0.5)S4 F d3m 4/m 3 2/m

2.10.1.15 Cuproiridsite CuIr2S4 F d3m 4/m 3 2/m

2.10.1.16 Cuprorhodsite CuRh2S4 F d3m 4/m 3 2/m

2.10.1.17 Malanite Cu(Pt,Ir)2S4 F d3m 4/m 3 2/m

2.10.1.18 Ferrorhodsite (Fe,Cu)(Rh,Ir,Pt)2S4 F d3m 4/m 3 2/m

2.10.1.19 Cadmoindite! CdIn2S4 F d3m 4/m 3 2/m

Strunz Class:

II/D.01-10 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.01 - Linneite group and related compounds

II/D.01-10 Greigite FeFe2S4 F d3m 4/m 3 2/m

II/D.01-20 Linnaeite CoCo2S4 F d3m 4/m 3 2/m

II/D.01-30 Polydymite NiNi2S4 F d3m 4/m 3 2/m

II/D.01-40 Carrollite Cu(Co,Ni)2S4 F d3m 4/m 3 2/m

II/D.01-50 Fletcherite Cu(Ni,Co)2S4 F d3m 4/m 3 2/m

II/D.01-60 Florensovite Cu(Cr1.5Sb0.5)S4 F d3m 4/m 3 2/m

II/D.01-70 Violarite FeNi2S4 F d3m 4/m 3 2/m

II/D.01-80 Siegenite (Ni,Co)3S4 F d3m 4/m 3 2/m

II/D.01-90 Indite FeIn2S4 F d3m 4/m 3 2/m

II/D.01-95 Cadmoindite! CdIn2S4 F d3m 4/m 3 2/m

II/D.01-100 Daubreelite FeCr2S4 F d3m 4/m 3 2/m

II/D.01-110 Kalininite ZnCr2S4 F d3m 4/m 3 2/m

II/D.01-120 Bornhardtite CoCo2Se4 F d3m 4/m 3 2/m

II/D.01-130 Trustedtite Ni3Se4 F d3m 4/m 3 2/m

II/D.01-140 Tyrrellite (Cu,Co,Ni)3Se4 F d3m 4/m 3 2/m

Other Greigite Information

References:

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

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Print or Cut-and-Paste your Greigite Specimen Label here :

Greigite

Fe++Fe+++2S4
Dana No: 2.10.1.10 Strunz No: II/D.01-10
Locality:

Notes: