Cobaltpentlandite (original) (raw)
Co is often replaced by minor Ni and Fe.
Specific Gravity:
5.22 (Calculated)
Name:
Originally named cobalt pentlandite (two words) in 1959 by O. Kuova, Maija Huhma, and Yrjö Vuorelainen, for its cobalt content and relation to pentlandite. The name was later changed to a single word by the International Mineralogical Association (Burke 2008).
Long-form identifier:
mindat:1:1:1097:5
a042991f-57e7-43cc-a48b-097f04f451b8
IMA status notes:
Renamed by the IMA
Type description reference:
2.BB.15
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
B : With Ni
2.7.1.3
2 : SULFIDES
7 : AmBnXp, with (m+n):p = 9:8
3.10.1
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
10 : Sulphides etc. of Co
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Copn | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Cpn | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Hardness:
VHN100=278 - 332 kg/mm2 - Vickers
Cleavage:
Distinct/Good
on {100}
Density:
5.22 g/cm3 (Calculated)
Reflectivity:
| Wavelength | R |
|---|---|
| 400nm | 36.9% |
| 420nm | 41.9% |
| 440nm | 45.9% |
| 460nm | 49.2% |
| 480nm | 51.7% |
| 500nm | 53.8% |
| 520nm | 55.6% |
| 540nm | 57.0% |
| 560nm | 58.2% |
| 580nm | 59.2% |
| 600nm | 60.0% |
| 620nm | 60.5% |
| 640nm | 61.0% |
| 660nm | 61.2% |
| 680nm | 61.4% |
| 700nm | 61.5% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 61.5%.
Colour in reflected light:
Slightly lighter bronze-yellow as compared to pentlandite
Mindat Formula:
Co9S8
Co is often replaced by minor Ni and Fe.
Class (H-M):
m_3_m _(_4/_m_32/m ) - Hexoctahedral
Cell Parameters:
a = 9.973 Å
Unit Cell V:
991.92 ų (Calculated from Unit Cell)
Morphology:
Exolved lammellae, crystals under 4mm.
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005106 | Cobaltpentlandite | Rajamani V, Prewitt C T (1975) Refinement of the structure of Co9S8 The Canadian Mineralogist 13 75-78 |  |
1975 | 0 | 293 | |
| 0018076 | Cobaltpentlandite | Lindqvist M, Lindqvist D, Westgren A (1936) The crystal structure of Co9 S8 and of pentlandite (Ni Fe)9 S8 _cod_database_code 1011206 Svensk Kemisk Tidskrift 48 156-160 | 1936 | 0 | 293 |
CIF Raw Data - click here to close
Reference:
Kuova, O., Huhma, M., and Vuorelainen, Y. (1959) A natural cobalt analog of pentlandite. American Mineralogist: 44: 897-900.
Other Members of this group:
Associated Minerals Based on Photo Data:
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Reference List:
Petruk, W., Harris, D. C., Stewart, J. M. (1969) Langisite, a new mineral, and the rare minerals cobalt pentlandite, siegenite, parkerite, and bravoite from the Langis mine, Cobalt-Gowganda area, Ontario, Canada. The Canadian Mineralogist, 9 (5) 597-616
Hazen, Robert M., Hystad, Grethe, Golden, Joshua J., Hummer, Daniel R., Liu, Chao, Downs, Robert T., Morrison, Shaunna M., Ralph, Jolyon, Grew, Edward S. (2017) Cobalt mineral ecology. American Mineralogist, 102 (1) 108-116 doi:10.2138/am-2017-5798
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.
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- 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.