Daubreelite Mineral Data

Daubreelite Mineral Data +

General Daubreelite Information

Chemical Formula:

Fe++Cr2S4

Composition:

Molecular Weight = 288.10 gm

Chromium 36.10 % Cr

Iron 19.38 % Fe

Sulfur 44.52 % S

______

100.00 %

Empirical Formula:

Fe²⁺Cr₂S₄

Environment:

In small amounts in many meteorites.

IMA Status:

Valid Species (Pre-IMA) 1876

Locality:

In iron meteorites, such as the Cosby's Creek, Toluca, Cranbourne, and Mundrabilla octahedrites, and the Coahuila, North Chile, and Scottsville hexahedrites. Link to MinDat.org Location Data.

Name Origin:

For Professor Gabriel Auguste Daubree (1814-1896), of Paris, France.

Synonym:

ICSD 36251

PDF 4-651

Daubreelite Image

Images:

Daubreelite Alabandite

Comments: Daubreelite (D), bright metallic white, with alabandite (A) (dull yellow) as inclusions in a polished section of an achondrite meteorite.
Location: Norton County, Kansas. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Daubreelite Crystallography

Cell Dimensions:

a = 9.966, Z = 8; V = 989.83 Den(Calc)= 3.87

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): 1.77(1), 3.02(0.8), 2.51(0.6),

Physical Properties of Daubreelite

Color:

Black.

Density:

3.81

Diaphaniety:

Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Hardness:

4.5-5 - Near Apatite

Luster:

Metallic

Streak:

brown black

Optical Properties of Daubreelite

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Daubreelite in Air**
λ	R	∑ R(λ)
400 nm	33.30
420 nm	33.20
440 nm	33.10
460 nm	33.00
480 nm	33.10
500 nm	33.10
520 nm	33.10
540 nm	33.00
560 nm	33.00
580 nm	32.90
600 nm	32.80
620 nm	32.70
640 nm	32.40
660 nm	32.30
680 nm	32.10
700 nm	31.90

**Calculated Relative Intensity Colors of Daubreelite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%	270%
R

Calculated Properties of Daubreelite

Electron Density:

r_electron=3.71 gm/cc
note: r_Daubreelite=3.87 gm/cc.

Fermion Index

Fermion Index = 0.04173
Boson Index = 0.95827

Photoelectric:

PE_Daubreelite= 16.45 barns/electron
U=PE_Daubreelite x r_electron= 60.97 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Daubreelite is Not Radioactive

Daubreelite Classification

Dana Class:

2.10.1.11 (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.01-100 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 Daubreelite Information

References:

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

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Daubreelite

Fe++Cr2S4
Dana No: 2.10.1.11 Strunz No: II/D.01-100
Locality:

Notes: