Hastite Mineral Data

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. Hastite (1955) was shown to be ferroselite

IMA Status:

Discredited IMA 2008 - 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.

Name Pronunciation:

Hastite

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

Diaphaneity:

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:

Bulk Density (Electron Density)=6.33 gm/cc
note: Specific Gravity of Hastite =7.23 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_Hastite= 68.46 barns/electron
U=PE_Hastite x rElectron Density= 433.64 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hastite is Not Radioactive

Hastite Classification

Dana Class:

02.12.02.04 (02)Sulfides - Including Selenides and Tellurides

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

(02.12.02)Marcasite Group (Orthorhombic: Pnnm)

02.12.02.01 Marcasite FeS2 Pnnm 2/m 2/m 2/m

02.12.02.02 Ferroselite FeSe2 Pnnm 2/m 2/m 2/m

02.12.02.03 Frohbergite FeTe2 Pnnm 2/m 2/m 2/m

02.12.02.04 Hastite? CoSe2 Pnnm 2/m 2/m 2/m

02.12.02.05 Mattagamite CoTe2 Pnnm 2/m 2/m 2/m

02.12.02.06 Kullerudite NiSe2 Pnnm 2/m 2/m 2/m

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

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

02.12.02.09 Lollingite FeAs2 Pnnm 2/m 2/m 2/m

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

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

02.12.02.12 Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m

02.12.02.13 Nisbite NiSb2 Pnnm 2/m 2/m 2/m

Strunz Class:

02.EB.10a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.E - Metal Sulfides, M:S £ 1:2

02.EB -M:S = 1:2, with Fe, Co, Ni, PGE, etc.

02.EB.10a Frohbergite FeTe2 Pnnm 2/m 2/m 2/m

02.EB.10a Hastite? CoSe2 Pnnm 2/m 2/m 2/m

02.EB.10a Ferroselite FeSe2 Pnnm 2/m 2/m 2/m

02.EB.10a Kullerudite NiSe2 Pnnm 2/m 2/m 2/m

02.EB.10a Mattagamite CoTe2 Pnnm 2/m 2/m 2/m

02.EB.10a Marcasite FeS2 Pnnm 2/m 2/m 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Hastite

CoSe2
Dana No: 02.12.02.04 Strunz No: 02.EB.10a
Locality:

Notes: