Bornhardtite Mineral Data

Bornhardtite Mineral Data +

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General Bornhardtite Information

Chemical Formula:

Co++Co+++2Se4

Composition:

Molecular Weight = 413.68 gm

Cobalt 42.74 % Co

Selenium 57.26 % Se

______

100.00 %

Empirical Formula:

CoCo₂Se₃

Environment:

Of hydrothermal origin.

IMA Status:

Valid Species (Pre-IMA) 1955

Locality:

At the Trogtal quarry, near Lautenthal, and at Tilkerode, Harz, Germany. Link to MinDat.org Location Data.

Name Origin:

After Dr. Wilhelm Bornhardt (1864-?), German student of ore deposits.

Synonym:

ICSD 42538

PDF 15-463

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Bornhardtite Crystallography

Cell Dimensions:

a = 10.2, Z = 8; V = 1,061.21 Den(Calc)= 5.18

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): 2.3(1), 2.4(1), 2.7(1),

Physical Properties of Bornhardtite

Color:

Copper, Pink.

Diaphaniety:

Opaque

Hardness:

4 - Fluorite

Luster:

Metallic

Optical Properties of Bornhardtite

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Bornhardtite in Air**
λ	R	∑ R(λ)
400 nm	41.30
420 nm	42.80
440 nm	44.30
460 nm	45.40
480 nm	46.40
500 nm	47.20
520 nm	47.80
540 nm	48.40
560 nm	49.20
580 nm	49.20
600 nm	49.70
620 nm	50.20
640 nm	50.80
660 nm	51.40
680 nm	52.00
700 nm	52.70

**Calculated Relative Intensity Colors of Bornhardtite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	200%
R

Calculated Properties of Bornhardtite

Electron Density:

r_electron=4.58 gm/cc
note: r_Bornhardtite=5.18 gm/cc.

Fermion Index

Fermion Index = 0.04351
Boson Index = 0.95649

Photoelectric:

PE_Bornhardtite= 61.17 barns/electron
U=PE_Bornhardtite x r_electron= 280.35 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bornhardtite is Not Radioactive

Bornhardtite Classification

Dana Class:

2.10.1.5 (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.01-120 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 Bornhardtite Information

References:

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

See Also:

Links to other databases for Bornhardtite :
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

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

Bornhardtite

Co++Co+++2Se4
Dana No: 2.10.1.5 Strunz No: II/D.01-120
Locality:

Notes: