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Sederholmite

Formula:
NiSe beta-NiSe
System:HexagonalColour:Brass-yellow to ...
Hardness:2½ - 3
Name:
Named in 1964 by Yrjö Vuorelainen after Jakob Johannes Sederholm [July 20, 1863 Helsinki, Finland - June 26, 1934], Director of the Geological Survey of Finland.
Isostructural with:Nickeline


Metallic brass yellow grains

Classification of Sederholmite

IMA status:Approved
Strunz 8th edition ID:2/C.20-50
Nickel-Strunz 10th (pending) edition ID:2.CC.05

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
C : Metal Sulfides, M: S = 1: 1 (and similar)
C : With Ni, Fe, Co, PGE, etc.
Dana 8th edition ID:2.8.11.3

2 : SULFIDES
8 : AmXp, with m:p = 1:1
Hey's CIM Ref.:3.11.15

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
11 : Sulphides etc. of Ni
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Type Occurrence of Sederholmite

Type Locality:Kuusamo, Oulun (Oulu) Lääni, Finland
Year of Discovery:1964
Geological Setting of type material:Calcite veins containing nickel selenides

Physical Properties of Sederholmite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:Brass-yellow to orange-yellow
Hardness (Mohs):2½ - 3
Tenacity:Brittle
Cleavage:None Observed
Fracture:Irregular/Uneven, Sub-Conchoidal
Density (calculated):7.11 g/cm3

Crystallography of Sederholmite

Crystal System:Hexagonal
Class (H-M):6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:P63/mmc {P63/m 2/m 2/c}
Cell Parameters:a = 3.624Å, c = 5.288Å
Ratio:a:c = 1 : 1.459
Unit Cell Volume:V 60.14 ų (Calculated from Unit Cell)
Z:2
Morphology:Microscopic grains
X-Ray Powder Diffraction:
d-spacingIntensity
2.70 (100)
2.02 (80)
1.81 (60)
1.54 (40)
1.50 (40)
1.35 (30)
1.16 (30)
Comments:18-0888

Chemical Properties of Sederholmite

Formula:
NiSe beta-NiSe
Essential elements:Ni, Se
All elements listed in formula:Ni, Se
Common Impurities:Co

Relationship of Sederholmite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
2.CC.05Achavalite
FeSe
2.CC.05Breithauptite
NiSb
2.CC.05Freboldite
CoSe
2.CC.05Kotulskite
Pd(Te,Bi)
 
1-2
2.CC.05Langisite
(Co,Ni)As
2.CC.05Nickeline
NiAs
2.CC.05Sobolevskite
PdBi
2.CC.05Stumpflite
Pt(Sb,Bi)
2.CC.05Sudburyite
(Pd,Ni)Sb
2.CC.05Jaipurite
CoS
2.CC.05Zlatogorite
NiCuSb
 
2
2.CC.10Pyrrhotite
Fe
 
7
S
 
8
, (-4M), also given as Fe
 
1-x
S (x = 0 - 0.2)
2.CC.10Smythite
(Fe,Ni)
 
9
S
 
11
2.CC.10Troilite
FeS
2.CC.15Cherepanovite
RhAs
2.CC.15Modderite
(Co,Fe)As
2.CC.15Ruthenarsenite
(Ru,Ni)As
2.CC.15Westerveldite
(Fe,Ni,Co)As
2.CC.20Millerite
NiS
2.CC.20Mäkinenite
γ-NiSe
2.CC.20UM1990-38-S:CuFeIrNiPtRh
(Ir,Pt,Ni,Fe)S
2.CC.25Mackinawite
(Fe,Ni)
 
9
S
 
8
2.CC.30Hexatestibiopanickelite
Ni(Te,Sb)
2.CC.30Vavřínite
Ni
 
2
SbTe
 
2
2.CC.35aBraggite
(Pt,Pd,Ni)S
2.CC.35bCooperite
(Pt,Pd,Ni)S
2.CC.35aVysotskite
(Pd,Ni)S
Related Minerals - Hey's Index Grouping:

- +
3.11.1Heazlewoodite
Ni
 
3
S
 
2
3.11.2Godlevskite
(Ni,Fe)
 
9
S
 
8
3.11.3Millerite
NiS
3.11.4Polydymite
Ni
2+
 
Ni
3+
2
S
 
4
3.11.5Vaesite
NiS
 
2
3.11.6Shandite
Ni
 
3
Pb
 
2
S
 
2
3.11.7Donharrisite
Ni
 
8
Hg
 
3
S
 
9
3.11.8Violarite
Fe
2+
 
Ni
3+
2
S
 
4
3.11.9Pentlandite
(Fe,Ni)
 
9
S
 
8
3.11.10Bravoite
(Fe,Ni)S
 
2
3.11.11Siegenite
from CoNi
 
2
S
 
4
 to NiCo
 
2
S
 
4
3.11.12Fletcherite
Cu(Ni,Co)
 
2
S
 
4
3.11.13Villamanínite
(Cu,Ni,Co,Fe)S
 
2
3.11.14Mäkinenite
γ-NiSe
3.11.16Trüstedtite
Ni
 
3
Se
 
4
3.11.17Wilkmanite
Ni
 
3
Se
 
4
3.11.18Kullerudite
NiSe
 
2
3.11.19Penroseite
(Ni,Co,Cu)Se
 
2
3.11.20Tyrrellite
Cu(Co
3+
 
,Ni
3+
 
)
 
2
Se
 
4
3.11.21Imgreite
NiTe (?)
3.11.22Melonite
NiTe
 
2
3.11.23Kitkaite
NiTeSe
3.11.24Dienerite
3.11.25Orcelite
Ni
 
5-x
As
 
2
3.11.26Maucherite
Ni
 
11
As
 
8
3.11.27Nickeline
NiAs
3.11.28Rammelsbergite
NiAs
 
2
3.11.29Pararammelsbergite
NiAs
 
2
3.11.30Nickelskutterudite
NiAs
 
2-3
3.11.31Oregonite
Ni
 
2
FeAs
 
2
3.11.32Westerveldite
(Fe,Ni,Co)As
3.11.33Langisite
(Co,Ni)As
3.11.34Gersdorffite
NiAsS
3.11.35Jolliffeite
NiAsSe
3.11.36Breithauptite
NiSb
3.11.38Ullmannite
NiSbS
3.11.39Willyamite
(Co,Ni)SbS

Other Names for Sederholmite

Other Languages:
German:Sederholmit
Russian:Седерхолмит
Spanish:Sederholmita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Sederholmite

Reference List:American Mineralogist (1965): 50: 519-520.

Internet Links for Sederholmite

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    Localities for Sederholmite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Finland
     
    • Oulun (Oulu) Lääni
    		Bull. Comm. Geol. Finland, 215:113-125.; Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990; Econ Geol (1997) 92:468-484
    Mineral and/or Locality
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