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UM1981-13-S:CoFeNiRh

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Formula:
(Fe,Ni,Rh,Co)9S8
Colour:
Light brown
Maybe just an impure pentlandite. In Pt-Fe alloy nuggets from Joubdo stream, Ethiopia. Found as (1) micron-sized blebs, (2) rounded inclusion, up to a l0 x 15 microns in size, or (3) lenticular inclusions, up to 25 x 110 microns in size, with angular and scalloped margins; the latter are associated with unnamed RhS phase and erlichmanite.

One of a few species from such Pt-Fe nuggets from Joubdo (compare, e.g., 'UM1981-08E:FeIrPtRhRu', 'UM1981-29-Te:BiRh', and the chemically similar 'UM1981-14-S:CuFeIrNiRh').


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Unique IdentifiersHide

Mindat ID:
47589
Long-form identifier:
mindat:1:1:47589:3

Physical Properties of UM1981-13-S:CoFeNiRhHide

Colour:
Light brown

Optical Data of UM1981-13-S:CoFeNiRhHide

Reflectivity:
WavelengthR1 (%)R2 (%)
400nm39.7%30.2%
420nm41.5%30.9%
440nm42.6%31.4%
460nm43.5%31.8%
480nm44.3%32.1%
500nm45.1%32.5%
520nm45.9%33.0%
540nm46.6%33.7%
560nm47.4%34.5%
580nm48.2%35.3%
600nm48.9%35.9%
620nm49.5%36.4%
640nm50.1%36.9%
660nm50.5%37.3%
680nm50.9%37.7%
700nm51.3%38.0%


Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 51.3%.
R1 shown in black, R2 shown in red
Comments:
Color values (air/oil): : 0.321/0.122 (x); 0.326/0.325 (y); 47.3/34.4 (Y); 579/579 (lambda d); 5.7/5.7 (Pe)

Chemistry of UM1981-13-S:CoFeNiRhHide

Mindat Formula:
(Fe,Ni,Rh,Co)9S8
Element Weights:
Element% weight
Fe66.209 %
S33.792 %

Calculated from ideal end-member formula.
Elements listed:
Co, Fe, Ni, Rh, S - search for minerals with similar chemistry

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 UM1981-13-S:CoFeNiRhHide

References for UM1981-13-S:CoFeNiRhHide

Localities for UM1981-13-S:CoFeNiRhHide

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.
Ethiopia
 
  • Oromia Region
    • West Welega Zone
      • Gimbi
Cabri et al. (1981) +1 other reference
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