Achavalite Mineral Data

Achavalite Mineral Data

General Achavalite Information

Chemical Formula:

FeSe

Composition:

Molecular Weight = 134.81 gm

Iron 41.43 % Fe

Selenium 58.57 % Se

______

100.00 %

Empirical Formula:

Fe²⁺Se

IMA Status:

Not Approved IMA

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 29308

PDF 26-795

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Achavalite Crystallography

Axial Ratios:

a:c = 1:1.63531

Cell Dimensions:

a = 3.636, c = 5.946, Z = 2; V = 68.08 Den(Calc)= 6.58

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6₃/mmc

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

By Intensity(I/I_o): 2.778(1), 2.159(0.9), 1.815(0.7),

Crystal Structure:

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Wyckoff R W G , Crystal Structures , 1 (1963) p.85-237, Second edition. Interscience Publishers, New York, New York, Note: ideal nickel arsenide structure

Physical Properties of Achavalite

Color:

Gray.

Density:

6.53

Diaphaniety:

Opaque

Hardness:

2.5 - Finger Nail

Luster:

Metallic

Calculated Properties of Achavalite

Electron Density:

r_electron=5.86 gm/cc
note: r_Achavalite=6.58 gm/cc.

Fermion Index

Fermion Index = 0.05329
Boson Index = 0.94671

Photoelectric:

PE_Achavalite= 59.64 barns/electron
U=PE_Achavalite x r_electron= 349.34 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Achavalite is Not Radioactive

Achavalite Classification

Dana Class:

2.0.0.0 (2)Sulfide Minerals

(2.0)Without Dana Classification Numbers

(Selenide)

Strunz Class:

II/C.19-60 II - Sulfides and sulphosalts

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.19 - Troilite - Pyrrhotite - Haideite series

II/C.19-10 Troilite FeS P 6₃/mmc 6/m 2/m 2/m

II/C.19-20 Pyrrhotite Fe(1-x)S(x=0-0.17) A2/a 2/m

II/C.19-25 Jaipurite* CoS P 6₃/mmc 6/m 2/m 2/m

II/C.19-30 Westerveldite (Fe,Ni,Co)As Pnam 2/m 2/m 2/m

II/C.19-40 Modderite (Co,Fe)As Pmcn 2/m 2/m 2/m

II/C.19-50 Smythite (Fe,Ni)9S11or(Fe,Ni)13S16 R 3m 3 2/m

II/C.19-60 Achavalite FeSe P 6₃/mmc 6/m 2/m 2/m

II/C.19-70 Heideite (Fe,Cr)1x(Ti,Fe)2S4 I2/m 2/m

Other Achavalite Information

References:

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

See Also:

Links to other databases for Achavalite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST 12 -École des Mines de Paris

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Achavalite

FeSe
Dana No: Unknown Strunz No: II/C.19-60
Locality:

Notes: