Mineralogy Database

Achavalite Mineral Data

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General Achavalite Information

Help on Chemical  Formula: Chemical Formula: FeSe
Help on Composition: Composition: Molecular Weight = 134.81 gm
   Iron      41.43 %  Fe
   Selenium  58.57 %  Se
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: Fe2+Se
Help on Environment: Environment: Same as synthetic delta-Fe7S8 with niccolite structure type. Needs additional work.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1939 (Dana # Added)
Help on Locality: Locality: Cerro de Cacheuta, Mendoza, Argentina. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for L. Achaval.
Help on Synonym: Synonym: ICSD 29308
  PDF 26-795
 

Achavalite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.63531
Help on Cell Dimensions: Cell Dimensions: a = 3.636, c = 5.946, Z = 2; V = 68.08 Den(Calc)= 6.58
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 63/mmc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.778(1), 2.159(0.9), 1.815(0.7),
 

Physical Properties of Achavalite

Help on Color: Color: Gray.
Help on Density: Density: 6.53
Help on Diaphaneity: Diaphaneity: Opaque
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Metallic
 

Calculated Properties of Achavalite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.86 gm/cc
note: Specific Gravity of Achavalite =6.58 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEAchavalite = 59.64 barns/electron
U=PEAchavalite x rElectron Density= 349.34 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Achavalite is Not Radioactive
 

Achavalite Classification

Help on  Dana Class: Dana Class: 02.08.11.11 (02)Sulfides - Including Selenides and Tellurides
  (02.08)where Am Bn Xp, with (m+n):p=1:1
  (02.08.11)Nickeline Group (Hexagonal: P63/mmc)
 
02.08.11.01 Nickeline NiAs P 63/mmc 6/m 2/m 2/m
 
02.08.11.02 Breithauptite NiSb P 63/mmc 6/m 2/m 2/m
 
02.08.11.03 Sederholmite NiSe P 63/mmc 6/m 2/m 2/m
 
02.08.11.04 Hexatestibiopanickelite (Ni,Pd)(Te,Sb) P 63/mmc 6/m 2/m 2/m
 
02.08.11.05 Sudburyite (Pd,Ni)Sb P 63/mmc 6/m 2/m 2/m
 
02.08.11.06 Kotulskite Pd(Te,Bi) P 63/mmc 6/m 2/m 2/m
 
02.08.11.07 Sobolevskite PdBi P 63/mmc 6/m 2/m 2/m
 
02.08.11.08 Stumpflite Pt(Sb,Bi) P 63/mmc 6/m 2/m 2/m
 
02.08.11.09 Langisite (Co,Ni)As P 63/mmc 6/m 2/m 2/m
 
02.08.11.10 Freboldite CoSe P 63/mmc 6/m 2/m 2/m
 
02.08.11.11 Achavalite! FeSe P 63/mmc 6/m 2/m 2/m
 
02.08.11.12 Sorosite! Cu(Sn,Sb) P 63/mmc 6/m 2/m 2/m
 
02.08.11.13 Vavrinite! Ni2SbTe2 P 63/mmc 6/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 02.CC.05 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.C - Metal Sulfides, M:S = 1:1 (and similar)
  02.CC -With Ni, Fe, Co, PGE, etc.
 
02.CC.05 Achavalite FeSe P 63/mmc 6/m 2/m 2/m
 
02.CC.05 Breithauptite NiSb P 63/mmc 6/m 2/m 2/m
 
02.CC.05 Freboldite CoSe P 63/mmc 6/m 2/m 2/m
 
02.CC.05 Hexatestibiopanickelite (Ni,Pd)(Te,Sb) P 63/mmc 6/m 2/m 2/m
 
02.CC.05 Langisite (Co,Ni)As P 63/mmc 6/m 2/m 2/m
 
02.CC.05 Jaipurite* CoS P 63/mmc 6/m 2/m 2/m
 
02.CC.05 Kotulskite Pd(Te,Bi) P 63/mmc 6/m 2/m 2/m
 
02.CC.05 Nickeline NiAs P 63/mmc 6/m 2/m 2/m
 
02.CC.05 Zlatogorite! CuNiSb2 P 3m1 3 2/m
 
02.CC.05 Sederholmite NiSe P 63/mmc 6/m 2/m 2/m
 
02.CC.05 Stumpflite Pt(Sb,Bi) P 63/mmc 6/m 2/m 2/m
 
02.CC.05 Sudburyite (Pd,Ni)Sb P 63/mmc 6/m 2/m 2/m
 
02.CC.05 Sobolevskite PdBi P 63/mmc 6/m 2/m 2/m
 

Other Achavalite Information

Help on References: References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Achavalite :
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 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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

Achavalite

FeSe
Dana No: 02.08.11.11 Strunz No: 02.CC.05
Locality:

 

Notes:

 

 
   
 


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