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.

Type Locality:

ⓘ Kitka River Valley, Kuusamo, North Ostrobothnia, Finland

Dimorph of:

Mäkinenite

Isostructural with:

Nickeline

Metallic brass yellow grains.

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Unique IdentifiersHide

Mindat ID:

3601

Long-form identifier:

mindat:1:1:3601:2

GUID
(UUID V4):

fe2ffb54-6f96-4535-94c0-680534ead27f

IMA Classification of SederholmiteHide

IMA status:

Approved

IMA Formula:

NiSe

First published:

1964

Type description reference:

Vuorelainen Y., Huhma A., Häkli A. (1964) Sederholmite, wilkmanite, kullerudite, mäkinenite, and trüstedtite, five new nickel selenide minerals. Comptes Rendus de la Société Géologique de Finlande: 36: 113-125.

Classification of SederholmiteHide

Strunz-mindat (2024):

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 ed.:

2.8.11.3

2 : SULFIDES
8 : A_mX_p, 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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol	Source	Reference
Sdh	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of SederholmiteHide

Lustre:

Metallic

Transparency:

Opaque

Colour:

Brass-yellow to orange-yellow

Hardness:

2½ - 3 on Mohs scale

Tenacity:

Brittle

Cleavage:

None Observed

Fracture:

Irregular/Uneven, Sub-Conchoidal

Density:

7.11 g/cm³ (Calculated)

Chemistry of SederholmiteHide

Mindat Formula:

beta-NiSe

Elements listed:

Ni, Se - search for minerals with similar chemistry

Common Impurities:

Crystallography of SederholmiteHide

Crystal System:

Hexagonal

Class (H-M):

6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal

Space Group:

P6₃/mmc

Cell Parameters:

a = 3.624 Å, c = 5.288 Å

Ratio:

a:c = 1 : 1.459

Unit Cell V:

60.14 Å³ (Calculated from Unit Cell)

Morphology:

Microscopic grains

Comment:

Synthetic material (Unoki et al., 2021) has: a = 3.66147 (10), c = 5.35766 (16) Å.

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Year	Locality	Temp (K)
0011582	Sederholmite	Wyckoff R W G (1963) Second edition. Interscience Publishers, New York, New York Crystal Structures 1 85-237	1963		293
0011904	Sederholmite	Rost E, Vestersjo E (1968) On the system Ni-Se-Te Acta Chemica Scandinavica 22 2118-2134	1968	synthetic	293
0011905	Sederholmite	Rost E, Vestersjo E (1968) On the system Ni-Se-Te Acta Chemica Scandinavica 22 2118-2134	1968	synthetic	293
0011906	Sederholmite	Rost E, Vestersjo E (1968) On the system Ni-Se-Te Acta Chemica Scandinavica 22 2118-2134	1968	synthetic	293
0011907	Sederholmite	Rost E, Vestersjo E (1968) On the system Ni-Se-Te Acta Chemica Scandinavica 22 2118-2134	1968	synthetic	293
0018201	Sederholmite	Alsen N (1925) Roentgenographische Untersuchungen der Kristallstrukturen von Magnetkies, Breithauptit, Pentlandit, Millerit und verwandten Verbindungen _cod_database_code 1011367 Geologiska Foreningens i Stockholm Forhandlingar 47 19-73	1925		293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Sederholmite'
loop_
_publ_author_name
'Wyckoff R W G'
_journal_name_full 'Crystal Structures'
_journal_volume 1 
_journal_year 1963
_journal_page_first 85
_journal_page_last 237
_publ_section_title
;
 Second edition. Interscience Publishers, New York, New York
 Note: ideal nickel arsenide structure
;
_database_code_amcsd 0011582
_chemical_formula_sum 'Ni Se'
_cell_length_a 3.6613
_cell_length_b 3.6613
_cell_length_c 5.3562
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 62.181
_exptl_crystal_density_diffrn      7.352
_symmetry_space_group_name_H-M 'P 63 m c'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,-x+y,1/2+z'
  'x-y,x,1/2+z'
  '-y,-x,z'
  '-y,x-y,z'
  'x-y,-y,1/2+z'
  '-x,-y,1/2+z'
  'x,x-y,z'
  '-x+y,-x,z'
  'y,x,1/2+z'
  'y,-x+y,1/2+z'
  '-x+y,y,z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Ni   0.00000   0.00000   0.00000
Se   0.33333   0.66667   0.25000

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
2.70 Å	(100)
2.02 Å	(80)
1.81 Å	(60)
1.54 Å	(40)
1.50 Å	(40)
1.35 Å	(30)
1.16 Å	(30)
1.08 Å	(30)

Comments:

18-0888

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
High-𝑇 alteration and/or metamorphism
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])

Type Occurrence of SederholmiteHide

Type Locality:

ⓘ Kitka River Valley, Kuusamo, North Ostrobothnia, Finland

General Appearance of Type Material:

In penroseite clusters of a few millimeters in diameter

Geological Setting of Type Material:

In calcite veins containing nickel selenides, in sills of albitite diabase in schist, associated with low-grade uranium mineralization

Associated Minerals at Type Locality:

Wilkmanite

Penroseite

Reference:

Download:

https://rruff.info/rruff_1.0/uploads/SGSJ36_113.pdf

Other Language Names for SederholmiteHide

German:Sederholmit

Russian:Седерхолмит

Spanish:Sederholmita

Relationship of Sederholmite to other SpeciesHide

Member of:

Nickeline Group

Other Members of this group:

Achávalite	FeSe	Hex. 6/mmm (6/m 2/m 2/m) : P6₃/mmc
Breithauptite	NiSb	Hex. 6/mmm (6/m 2/m 2/m) : P6₃/mmc
Freboldite	CoSe	Hex. 6/mmm (6/m 2/m 2/m) : P6₃/mmc
Kotulskite	Pd(Te,Bi)_2-x (x ≈ 0.4)	Hex.
Langisite	CoAs	Hex. 6 : P6₃
Nickeline	NiAs	Hex. 6/mmm (6/m 2/m 2/m) : P6₃/mcm
Sobolevskite	PdBi	Hex.
Stumpflite	PtSb	Hex. 6/mmm (6/m 2/m 2/m) : P6₃/mmc
Sudburyite	PdSb	Hex. 6/mmm (6/m 2/m 2/m) : P6₃/mmc
Vavřínite	Ni₂SbTe₂	Hex. 6/mmm (6/m 2/m 2/m) : P6₃/mmc
Zlatogorite	NiCuSb₂	Trig. 3m (3 2/m) : P3 1m

Related Minerals - Strunz-mindat Grouping Hide

2.CC.	Tilkerodeite	Pd₂HgSe₃	Trig. 3m (3 2/m) : P3m1
2.CC.	UM2007-26-S:CuFeIrNiPtRh	(Ir,Cu,Ni,Pt,Rh,Fe)₉S₁₁
2.CC.	Crowningshieldite	(Ni_0.9Fe_0.10)S	Hex. 6/mmm (6/m 2/m 2/m) : P6₃/mmc
2.CC.	Eliopoulosite	V₇S₈	Trig. 3 2 : P3₂ 2 1
2.CC.	Kuvaevite	Ir₅Ni₁₀S₁₆	Trig. 3m (3 2/m) : R3m
2.CC.	Torryweiserite	Rh₅Ni₁₀S₁₆	Trig. 3m (3 2/m) : R3m
2.CC.	Tamuraite	Ir₅Fe₁₀S₁₆	Trig. 3m (3 2/m) : R3m
2.CC.	Ferrotorryweiserite	Rh₅Fe₁₀S₁₆	Trig. 3m (3 2/m) : R3m
2.CC.05	Achávalite	FeSe	Hex. 6/mmm (6/m 2/m 2/m) : P6₃/mmc
2.CC.05	Breithauptite	NiSb	Hex. 6/mmm (6/m 2/m 2/m) : P6₃/mmc
2.CC.05	Freboldite	CoSe	Hex. 6/mmm (6/m 2/m 2/m) : P6₃/mmc
2.CC.05	Kotulskite	Pd(Te,Bi)_2-x (x ≈ 0.4)	Hex.
2.CC.05	Langisite	CoAs	Hex. 6 : P6₃
2.CC.05	Nickeline	NiAs	Hex. 6/mmm (6/m 2/m 2/m) : P6₃/mcm
2.CC.05	Sobolevskite	PdBi	Hex.
2.CC.05	Stumpflite	PtSb	Hex. 6/mmm (6/m 2/m 2/m) : P6₃/mmc
2.CC.05	Sudburyite	PdSb	Hex. 6/mmm (6/m 2/m 2/m) : P6₃/mmc
2.CC.05	Jaipurite	CoS	Hex.
2.CC.05	Zlatogorite	NiCuSb₂	Trig. 3m (3 2/m) : P3 1m
2.CC.10	Pyrrhotite	Fe_1-xS	Mon.
2.CC.10	Smythite	(Fe,Ni)_3+xS₄ (x=0-0.3)	Trig. 3m (3 2/m) : R3m
2.CC.10	Troilite	FeS	Hex. 6/mmm (6/m 2/m 2/m) : P6₃/mmc
2.CC.15	Cherepanovite	RhAs	Orth. mmm (2/m 2/m 2/m) : Pnma
2.CC.15	Modderite	(Co,Fe)As	Orth. mmm (2/m 2/m 2/m)
2.CC.15	Ruthenarsenite	(Ru,Ni)As	Orth. mmm (2/m 2/m 2/m) : Pnma
2.CC.15	Westerveldite	(Fe,Ni,Co)As	Orth. mmm (2/m 2/m 2/m)
2.CC.15	Minakawaite	RhSb	Orth. mmm (2/m 2/m 2/m) : Pnma
2.CC.20	Millerite	NiS	Trig. 3m : R3m
2.CC.20	Mäkinenite	γ-NiSe	Trig. 3m
2.CC.20	UM1990-38-S:CuFeIrNiPtRh	(Ni,Fe,Rh,Cu,Ir,Pt)S
2.CC.25	Mackinawite	FeS	Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm
2.CC.30	Hexatestibiopanickelite	(Pd,Ni)(Sb,Te) ?	Hex.
2.CC.30	Vavřínite	Ni₂SbTe₂	Hex. 6/mmm (6/m 2/m 2/m) : P6₃/mmc
2.CC.35a	Braggite	PdPt₃S₄	Tet. 4/m : P4₂/m
2.CC.35b	Cooperite	PtS	Tet. 4/mmm (4/m 2/m 2/m) : P4₂/mmc
2.CC.35a	Vysotskite	PdS	Tet. 4/m : P4₂/m
2.CC.45	Jacutingaite	Pt₂HgSe₃	Trig. 3m (3 2/m) : P3m1
2.CC.50	Imgreite	NiTe (?)	Hex.

Other InformationHide

Health Risks:

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

Internet Links for SederholmiteHide

mindat.org URL:

https://www.mindat.org/min-3601.html
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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

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References for SederholmiteHide

Reference List:

Fleischer, M. (1965) New mineral names. American Mineralogist: 50: 519-522.

Røst, E., Vestersjø, E. (1968) On the system Ni-Se-Te. Acta Chemica Scandinavica: 22: 2118-2134.

Grønvold, F. (1970) Heat capacities and thermodynamic properties of the Ni1-xSe phase from 298-1050°K. Acta Chemica Scandinavica: 24: 1036-1050.

Unoki, K., Yoshiasa, A., Kitahara, G., Nishiayama, T., Tokuda, M., Sugiyama, K., Nakatsuka, A. (2021) Crystal structure refinements of stoichiometric Ni3Se2 and NiSe. Acta Crystallographica: C77: 169-175.

(2023) Sederholmite. Handbook of Mineralogy. Mineralogical Society of America

Localities for SederholmiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the

symbol to view information about a locality. The

symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed.

- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality.

- Good crystals or important locality for species.

- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). ~~Struck out~~ - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.


Finland
North Ostrobothnia ⓘ Kuusamo	Vuorelainen Y et al. (1964) +1 other reference
ⓘ Kitka River Valley (TL)	Vuorelainen et al. (1964)

Sederholmite