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Nickeltyrrellite

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About NickeltyrrelliteHide

Formula:
CuNi2Se4
Colour:
Black
Lustre:
Metallic
Specific Gravity:
7.36 (Calculated)
Crystal System:
Isometric
Name:
In allusion to being the Ni-dominant analogue of tyrrellite.
Isostructural with:
The Ni analogue of tyrrellite. Unique combination of elements.

Nickeltyrrellite formed in response to alteration of quijarroite + hansblockite + watkinsonite + clausthalite + penroseite aggregates by oxidizing, low-T, Cu-Ni-Co-Pb-bearing fluids at a fSe2/fS2 ratio greater than unity (Förster et al. 2019).

Note:
X-ray powder diffraction pattern not available (CNMNC Newsletter No. 47).


Classification of NickeltyrrelliteHide

Approved
Approval Year:
2018
First Published:
2019

Physical Properties of NickeltyrrelliteHide

Metallic
Transparency:
Opaque
Colour:
Black
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
No obvious parting
Fracture:
Irregular/Uneven
Density:
7.36 g/cm3 (Calculated)

Optical Data of NickeltyrrelliteHide

Type:
Isotropic
Anisotropism:
Between crossed polarizers, it is isotropic
Reflectivity:
470 nmR=45.9 %
546 nmR=47.6%
589 nmR=48.1%
650 nmR=49.8%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 49.8%.

Chemical Properties of NickeltyrrelliteHide

Formula:
CuNi2Se4

Crystallography of NickeltyrrelliteHide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fd3m
Cell Parameters:
a = 9.99 Å
Unit Cell V:
997 ų
Z:
8
Morphology:
Anhedral to subhedral grains (up to 20 μm in size).

Type Occurrence of NickeltyrrelliteHide

General Appearance of Type Material:
Anhedral to subhedral grains (up to 20 μm in size)
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Natural History Museum, London, catalogue number BM2018,19 (holotype), and the Mineralogical State Collection Munich − Museum Reich der Kristalle, inventory number MSM 73587 (cotype)
Empirical Formula of Type Material:
Cu1.00(Ni1.42Co0.56Fe0.02)Σ2.00(Se3.84S0.16)Σ4.00
Chemical Analysis of Type Material:
Cu13.01 %
Fe0.27 %
Co6.66 %
Ni16.98 %
S1.04 %
Se61.91 %
Total:99.87 %
Associated Minerals at Type Locality:
Reference:
Förster, H.-J., Ma, C. Grundmann, G., Bindi, L. & Stanley . c. J. (2019) Nickeltyrrellite, CuNi2Se4, a New Member of the Spinel Supergroup from El Dragón, Bolivia. The Canadian Mineralogist (2019) canmin.1900025. https://doi.org/10.3749/canmin.1900025

Synonyms of NickeltyrrelliteHide

Relationship of Nickeltyrrellite to other SpeciesHide

Other Members of this group:
Bornhardtite SubgroupA2+D3+2Se4
TyrrelliteCu(Co3+,Ni3+)2Se4Iso. m3m (4/m 3 2/m) : Fd3m

Fluorescence of NickeltyrrelliteHide

Non-fluorescent

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.

References for NickeltyrrelliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Förster, H.-J., Ma, C., Grundmann, G., Bindi, L., and Stanley, C.J. (2019) Nickeltyrrellite, IMA 2018-110. CNMNC Newsletter No. 47, February 2019, page 200; European Journal of Mineralogy, 31: 199–204.
Förster, H.-J., Ma, C. Grundmann, G., Bindi, L. & Stanley . c. J. (2019) Nickeltyrrellite, CuNi2Se4, a New Member of the Spinel Supergroup from El Dragón, Bolivia. The Canadian Mineralogist (2019) canmin.1900025. https://doi.org/10.3749/canmin.1900025

Internet Links for NickeltyrrelliteHide

Localities for NickeltyrrelliteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Bolivia (TL)
 
  • Potosí
    • Antonio Quijarro Province
Förster, H.-J., Ma, C., Grundmann, G., Bindi, L., and Stanley, C.J. (2019) Nickeltyrrellite, IMA 2018-110. CNMNC Newsletter No. 47, February 2019, page 200; European Journal of Mineralogy, 31: 199–204.; Förster, H.-J., Ma, C. Grundmann, G., Bindi, L. & Stanley . c. J. (2019) Nickeltyrrellite, CuNi2Se4, a New Member of the Spinel Supergroup from El Dragón, Bolivia. The Canadian Mineralogist (2019) canmin.1900025. https://doi.org/10.3749/canmin.1900025
 
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