Mineralogy Database

Sederholmite Mineral Data

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General Sederholmite Information

Help on Chemical  Formula: Chemical Formula: NiSe
Help on Composition: Composition: Molecular Weight = 137.65 gm
   Nickel    42.64 %  Ni
   Selenium  57.36 %  Se
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: NiSe
Help on Environment: Environment: In calcite veins, in sills of albitite diabase in schist, associated with low-grade uranium mineralization. As grains in clausthalite.
Help on IMA Status: IMA Status: Approved IMA 1964
Help on Locality: Locality: Kuusamo, northeastern Finland Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for J. J. Sederholm, former Director of the Gological Survey of Finland.
Help on Name Pronunciation: Name Pronunciation: Sederholmite + Pronunciation Say SEDERHOLMITE
Help on Synonym: Synonym: ICSD 29310
  Nickel Selenide
  PDF 18-188
 

Sederholmite Image

Click Here for Larger   Image in a New Browser Window Images:
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  Kitkaite   Penroseite   Sederholmite

Comments: B&W polished section image showing kitkaite replacing calcite in penroseite, clausthalite and sederholmite. Note the absence of the clausthalite envelope around kitkaite..
Location: Valley of the Kitka river in Kuusamo, northeast Finland. (AmMin, v50:581). Scale: 100 X.
© American Mineralogist

Sederholmite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.46301
Help on Cell Dimensions: Cell Dimensions: a = 3.65, c = 5.34, Z = 2; V = 61.61 Den(Calc)= 7.42
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): 2.7(1), 2.015(0.8), 1.806(0.6),
 

Physical Properties of Sederholmite

Help on Cleavage: Cleavage: None
Help on Color: Color: Yellow, Orange yellow.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luster: Luster: Metallic
 

Optical Properties of Sederholmite

Help on RL Anisotrophism: RL Anisotrophism: Strong to distinct, in pinkish to greenish colors.
Help on RL Color: RL Color: Yellow to orange yellow.
Help on RL Pleochroism: RL Pleochroism: Distinct in shades of yellow.
 

Calculated Properties of Sederholmite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.68 gm/cc
note: Specific Gravity of Sederholmite =7.42 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PESederholmite = 63.01 barns/electron
U=PESederholmite x rElectron Density= 421.14 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sederholmite is Not Radioactive
 

Sederholmite Classification

Help on  Dana Class: Dana Class: 02.08.11.03 (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 Sederholmite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Sederholmite :
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 Sederholmite Specimen Label here :

Sederholmite

NiSe
Dana No: 02.08.11.03 Strunz No: 02.CC.05
Locality:

 

Notes:

 

 
   
 


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