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Hastite (Hastit)

Collectors Summary

Color bräunlich rot, rot violet
Hardness (Mohs) 6
Crystal System orthorhombisch, Pmnn

Chemism

Chemical formula

CoSe2

Additional chem. information

Typmaterial ist identisch mit Ferroselit FeSe2

Chemical composition

Kobalt, Selen

Unit weight: 216.8592009 u; Number of atoms in the formula: 3

Info

Empirical formula:

CoSe2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Cobalt

Co

27.18

1

33.33

58.9332009

58.9332009
Selenium

Se

72.82

2

66.67

78.9630000

157.9260000

Analysis wt%

Co : 27.18, Se : 72.82 (Ref: berechnet)

Strunz 9th edition incl. updates

2.EB.10

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfarsenite, Sulfantimonite, Sulfbismuthite)
E: Metallsulfide mit M:S >= 1:2
B: M:S = 1:2, mit Fe, Co, Ni, PGE, usw.
10:Markasit-Gruppe

Classification by Hölzel

2.EB.640

2: SULFIDES
E: Me/S=1/2 (also < 1/2)
B: With Fe,Co,Ni,PGE Pyrite, Marcasite Family
6: Marcasite-Group

Dana 8th edition

02.12.02.04

02: Sulfide Minerals
12: Sulfides - Including Selenides and Tellurides where Am Bn Xp, with (m+n):p=1:2
02: Marcasite Group (Orthorhombic: Pnnm)

IMA status

Diskreditiert, IMA Sept. 2009 identisch mit Ferroselit

Mineral status

Mineralstatus fragwürdig

Optical Properties

Color

bräunlich rot, rot violet

Diaphaneity (Transparency)

opak

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

58

Space Group

Pmnn

Cell parameters a (Å)

3.60

Cell parameters b (Å)

4.84

Cell parameters c (Å)

5.72

Cell parameters a/b or c/a

0.744

Cell parameters c/b

1.182

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

2

Volumne (ų)

99.665

X-Ray Powder Diffraction

2.9(30),
2.6(100),
2.5(100),
1.9(100),
1.61(30),
1.44(30),
1.02(100)
XRD chart Hastite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Physical Properties

Hardness (Mohs)

6

Density (g/cm³)

7.22

7.226 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Deutschland/Niedersachsen/Goslar, Landkreis/Langelsheim/Lautenthal/Trogtal

Preface

Author (Name, Year)

Ramdohr & Schmitt, 1955

References

Handbook of Mineralogy (Anthony et al.), 1 (1990), 204

Keutsch, Förster, Stanley, Rhede (2009): The discredition of hastite, the orthorhombic dimorph of CoSe2, and observations on trogtalite, cubic CoSe2, from the type locality. In: The Canadian Mineralogist 47, pp. 969-976

Other languages

German

Hastit

Spanish

Hastita

French

Hastite

English

Hastite

Russian

Хастит

Japanese

ﾊｽﾄ鉱

CNMNC (IMA)-Number

IMA 07-E

Locations with GPS information