Hastite Mineral Data

Hastite Mineral Data +

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General Hastite Information

Chemical Formula:

CoSe2

Composition:

Molecular Weight = 216.85 gm

Cobalt 27.18 % Co

Selenium 72.82 % Se

______

100.00 %

Empirical Formula:

CoSe₂

Environment:

In hydrothermal veins.

IMA Status:

Valid Species (Pre-IMA) 1955

Locality:

In Germany, from the Trogtal quarry, near Lautenthal, in the upper Harz. Link to MinDat.org Location Data.

Name Origin:

For Dr. P.F. Hast, mining engineer.

Synonym:

ICSD 42540

PDF 10-408

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Hastite Crystallography

Axial Ratios:

a:b:c =0.7438:1:1.1818

Cell Dimensions:

a = 3.6, b = 4.84, c = 5.72, Z = 2; V = 99.67 Den(Calc)= 7.23

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnnm

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

By Intensity(I/I_o): 1.9(1), 2.5(1), 2.6(1),

Physical Properties of Hastite

Color:

Brownish red, Red violet.

Density:

7.22

Diaphaniety:

Opaque

Hardness:

6 - Orthoclase

Luster:

Metallic

Optical Properties of Hastite

RL Anisotrophism:

Strong.

RL Pleochroism:

Strong, especially in oil.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Hastite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	46.60	47.20
420 nm	46.40	47.70
440 nm	46.20	48.20
460 nm	46.10	48.80
480 nm	46.00	49.60
500 nm	46.20	50.40
520 nm	46.60	51.20
540 nm	46.90	52.20
560 nm	47.40	53.30
580 nm	47.90	54.20
600 nm	48.50	55.40
620 nm	49.10	56.40
640 nm	49.70	57.20
660 nm	50.40	58.00
680 nm	51.00	58.60
700 nm	51.40	59.00

**Calculated Relative Intensity Colors of Hastite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%	190%
R₁
R₂

Calculated Properties of Hastite

Electron Density:

r_electron=6.33 gm/cc
note: r_Hastite=7.23 gm/cc.

Fermion Index

Fermion Index = 0.05534
Boson Index = 0.94466

Photoelectric:

PE_Hastite= 68.46 barns/electron
U=PE_Hastite x r_electron= 433.64 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hastite is Not Radioactive

Hastite Classification

Dana Class:

2.12.2.4 (2)Sulfides - Including Selenides and Tellurides

(2.12)where Am Bn Xp, with (m+n):p=1:2

(2.12.2)Marcasite Group (Orthorhombic: Pnnm)

2.12.2.1 Marcasite FeS2 Pnnm 2/m 2/m 2/m

2.12.2.2 Ferroselite FeSe2 Pnnm 2/m 2/m 2/m

2.12.2.3 Frohbergite FeTe2 Pnnm 2/m 2/m 2/m

2.12.2.4 Hastite CoSe2 Pnnm 2/m 2/m 2/m

2.12.2.5 Mattagamite CoTe2 Pnnm 2/m 2/m 2/m

2.12.2.6 Kullerudite NiSe2 Pnnm 2/m 2/m 2/m

2.12.2.7 Omeiite (Os,Ru)As2 Pnnm 2/m 2/m 2/m

2.12.2.8 Anduoite (Ru,Os)As2 Pnnm 2/m 2/m 2/m

2.12.2.9 Lollingite FeAs2 Pnnm 2/m 2/m 2/m

2.12.2.10 Seinajokite (Fe,Ni)(Sb,As)2 Pnnm 2/m 2/m 2/m

2.12.2.11 Safflorite (Co,Fe)As2 Pnnm 2/m 2/m 2/m

2.12.2.12 Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m

2.12.2.13 Nisbite NiSb2 Pnnm 2/m 2/m 2/m

Strunz Class:

II/D.20-30 II - Sulfides and sulphosalts

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

II/D.20 - Markasite - Iridarsenite series

II/D.20-10 Marcasite FeS2 Pnnm 2/m 2/m 2/m

II/D.20-20 Ferroselite FeSe2 Pnnm 2/m 2/m 2/m

II/D.20-30 Hastite CoSe2 Pnnm 2/m 2/m 2/m

II/D.20-40 Kullerudite NiSe2 Pnnm 2/m 2/m 2/m

II/D.20-50 Frohbergite FeTe2 Pnnm 2/m 2/m 2/m

II/D.20-60 Mattagamite CoTe2 Pnnm 2/m 2/m 2/m

II/D.20-70 Anduoite (Ru,Os)As2 Pnnm 2/m 2/m 2/m

II/D.20-80 Omeiite (Os,Ru)As2 Pnnm 2/m 2/m 2/m

II/D.20-90 Iridarsenite (Ir,Ru)As2 P 2₁/c 2/m

Other Hastite Information

References:

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

See Also:

Links to other databases for Hastite :
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 Hastite Specimen Label here :

Hastite

CoSe2
Dana No: 2.12.2.4 Strunz No: II/D.20-30
Locality:

Notes: