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Achávalite

Additional Functions

Collectors Summary

Color grau
Streak color grau-schwarz
Hardness (Mohs) 2.5
Crystal System hexagonal, P63/mmc

Chemism

Chemical formula

FeSe

Chemical composition

Eisen, Selen

Unit weight: 134.8082 u; Number of atoms in the formula: 2

Info

Empirical formula:

FeSe

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Iron

Fe

41.43

1

50.00

55.8452000

55.8452000

Selenium

Se

58.57

1

50.00

78.9630000

78.9630000

Analysis wt%

Fe : 41.43, Se : 58.57 (Ref: berechnet)

Strunz 9th edition incl. updates

2.CC.05

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfarsenite, Sulfantimonite, Sulfbismuthite)
C: Metallsulfide, M : S = 1 : 1 (und ähnliche)
C: mit Nickel (Ni), Eisen (Fe), Cobalt (Co), usw.
05:Nickelin-Gruppe

Lapis Classification

II/C.19-060

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
C: Sulfide mit Metall : S,Se,Te ~ 1:1

Classification by Hölzel

2.CC.300

2: SULFIDES
C: Sulfides (etc) with Me/S=1/1
C: With Pd,Pt, etc. - Coordination Number ~[4], Planar
3: Coordination Number ~[3+3] Nickeline-Group

Dana 8th edition

02.00.00.00

02: Sulfide Minerals
00: Sulfide Minerals Without Dana Classification Numbers

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

Optical Properties

Color

grau

Streak color

grau-schwarz

Diaphaneity (Transparency)

opak

Crystallography

Crystal System

hexagonal

Class (H-M)

6/mmm

Space Group number

194

Space Group

P63/mmc

Cell parameters a (Å)

3.636

Cell parameters b (Å)

-

Cell parameters c (Å)

5.946

Cell parameters a/b or c/a

1.635

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

2

Volumne (ų)

68.077

X-Ray Powder Diffraction

2.778(100),
2.159(90),
1.815(70),
1.675(30),
1.519(30),
1.165(40),
1.149(30),
1.103(30)

XRD chart Achávalite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

2.5

VHN (Hardness Vickers)

53 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

6.53

6.576 ( ρ calc. Mineralienatlas )

Preface

Name from

Achaválit wurde beannt nach Luis Achával (geb. 8 Juni 1870 in Córdoba - gestorben am 20. März 1938). Luis Achavál war Professor an der Universidad Nacional de Córdoba. Er war Autor von "Geografia de Córdoba" mit Manuel Rio und war Präsident der Academia de Ciencia.

Author (Name, Year)

Olsacher, 1939

References

Boletin de la Facultad de Ciencias Exactas, Fisicas y Naturales, Universidad Nacional de Cordoba 2(1939), 73

Neues Jahrbuch für Mineralogie, Monatshefte (1972), 276

IMA 15-E: Spelling of names of eight mineral species Proposal 15-E is accepted, and the spelling of eight mineral names is modified as follows: achavalite becomes achávalite; behierite becomes béhierite; camerolaite becomes camérolaite; fabriesite becomes fabrièsite; remondite-(Ce) becomes rémondite-(Ce); remondite-(La) becomes rémondite-(La); sénarmontite becomes senarmontite; sérandite becomes serandite.

Other languages

German

Achávalit

Spanish

Achávalita

English

Achávalite

French

Achávalite

Russian

Ачавалит

Simplified Chinese

硒铁矿

CNMNC symbol

Symbol

Ahv