UM1991-19-Se:AsCo

Valid as an unnamed mineral

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Discuss UM1991-19-Se:AsCo

Edit UM1991-19-Se:AsCo Add Synonym Edit CIF structures Clear Cache

Formula:

(Co,Ni)AsSe

Colour:

White

Lustre:

Metallic

Hardness:

3 - 3½

Specific Gravity:

7.1 (Calculated)

Crystal System:

Isometric

Member of:

Cobaltite Group

Co-described with jolliffeite. Found as small, discrete, anhedral grains, with clausthalite and some unidentified selenides of Bi and Pb-Bi-Ag, within 'pitchblende'.

Optically quite similar to jolliffeite. Could represent a Se analogue of either cobaltite or glaucodot.

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Unique IdentifiersHide

Mindat ID:

52065

Long-form identifier:

mindat:1:1:52065:2

IMA Classification of UM1991-19-Se:AsCoHide

IMA status notes:

Unnamed (probably valid)

First published:

1991

Physical Properties of UM1991-19-Se:AsCoHide

Lustre:

Metallic

Transparency:

Opaque

Colour:

White

Hardness:

3 - 3½ on Mohs scale

Hardness Data:

Estimated

Tenacity:

Brittle

Cleavage:

None Observed

Fracture:

Sub-Conchoidal

Density:

7.1 g/cm³ (Calculated)

Optical Data of UM1991-19-Se:AsCoHide

Anisotropism:

slightly more anisotropic than jolliffeite

Chemistry of UM1991-19-Se:AsCoHide

Mindat Formula:

(Co,Ni)AsSe

Element Weights:

Element	% weight
Se	37.103 %
As	35.205 %
Co	27.692 %

Calculated from ideal end-member formula.

Elements listed:

As, Co, Ni, Se - search for minerals with similar chemistry

Crystallography of UM1991-19-Se:AsCoHide

Crystal System:

Isometric

Class (H-M):

m3 (2/m 3) - Diploidal

Space Group:

Pm3

Cell Parameters:

a = 5.831 Å

Unit Cell V:

198.26 Å³ (Calculated from Unit Cell)

Morphology:

Crystals rare or unknown

Comment:

probably not orthorhombic

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
2.916 Å	(50)
2.602 Å	(100)
2.378 Å	(80)
2.062 Å	(30)
1.757 Å	(80)
1.617 Å	(40)
1.559 Å	(50)

Comments:

the pattern couldn't be indexed; it differs from that of synthetic CoAsSe

Synonyms of UM1991-19-Se:AsCoHide

Unnamed (Co Arsenide-Selenide)

Relationship of UM1991-19-Se:AsCo to other SpeciesHide

Member of:

Cobaltite Group

Other Members of Cobaltite Group:

Andrieslombaardite	RhSbS	Iso. 2 3 : P2₁ 3
Changchengite	IrBiS	Iso. 2 3 : P2₁ 3
Cobaltite	CoAsS	Orth. mm2 : Pca2₁
Gersdorffite	NiAsS	Iso. 2 3 : P2₁ 3
Guixiangite	NiBiS	Iso. 2 3 : P2₁ 3
Hollingworthite	(Rh,Pt,Pd)AsS	Iso. m3 (2/m 3) : Pa3
Irarsite	(Ir,Ru,Rh,Pt)AsS	Iso. m3 (2/m 3) : Pa3
Jolliffeite	NiAsSe	Iso. m3 (2/m 3) : Pa3
Kalungaite	PdAsSe	Iso. m3 (2/m 3) : Pa3
Maslovite	PtBiTe	Iso. 2 3 : P2₁ 3
Mayingite	IrBiTe	Iso. m3 (2/m 3) : Pa3
Michenerite	PdBiTe	Iso. 2 3 : P2₁ 3
Milotaite	PdSbSe	Iso. 2 3 : P2₁ 3
Padmaite	PdBiSe	Iso. 4 3 2
Platarsite	Pt(As,S)₂	Iso. m3 (2/m 3) : Pa3
Testibiopalladite	PdSbTe	Iso.
Tolovkite	IrSbS	Iso.
Ullmannite	NiSbS	Iso. 2 3 : P2₁ 3
Willyamite	CoSbS

Fluorescence of UM1991-19-Se:AsCoHide

In UV light:

Not fluorescent in UV

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 UM1991-19-Se:AsCoHide

mindat.org URL:

https://www.mindat.org/min-52065.html
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References for UM1991-19-Se:AsCoHide

Reference List:

Cabri, Louis J., Laflamme, H. Gilles, Robert, Andrew C., Criddle, Alan J,, Hulbert, Larry J. (1991) Jolliffeite and unnamed CoAsSe; two new arsenoselenides from the north shore of Lake Athabasca, Saskatchewan. The Canadian Mineralogist, 29 (3) 411-418

Maasha, L. (1994): Selenium-bearing sulfarsenides of the cobaltite-gersdorffite series from deposits of Bu-Azzer district (Morocco). Zapiski Vserossiiskogo Mineralogicheskogo Obshchestva 123, 64-68 (in Russian).

Smith, D. G.W.; Nickel, E. H. (2007) A System of Codification for Unnamed Minerals: Report of the Subcommittee for Unnamed Minerals of the IMA Commission on New Minerals, Nomenclature and Classification. The Canadian Mineralogist, 45 (4). 983-990 doi:10.2113/gscanmin.45.4.983

Localities for UM1991-19-Se:AsCoHide

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

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