Grimmite
A valid IMA mineral species
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About Grimmite
Johann Grimm
Formula:
NiCo2S4
Colour:
Grey with a pinkish tint
Lustre:
Metallic
Hardness:
4½ - 5½
Specific Gravity:
4.96 (Calculated)
Crystal System:
Isometric
Member of:
Name:
Named in honor of Johann Grimm (24 June or 24 July 1805, Jáchymov, (now) Czech Republic – 26 June 1874, Břasy, (now) Czech Republic). He was the leading mining and mill administrator in Příbram, modernizing operations. He was also the second director of the Příbram Mining College. He wrote many books about mining technologies, geology, mining education, and Czech and Hungarian ore districts.
Note: for a long time, the composition NiCo2S4 was poorly defined as a mineral (some authors included it into the definition of siegenite). In 2020, it was finally approved as a new species.
Knop et al. (1968) showed that the structure is that of a normal spinel (unlike siegenite, which is an inverse spinel).
It is not an uncommon member of the linnaeite group, but rarer than siegenite.
Knop et al. (1968) showed that the structure is that of a normal spinel (unlike siegenite, which is an inverse spinel).
It is not an uncommon member of the linnaeite group, but rarer than siegenite.
Unique Identifiers
Mindat ID:
55244
Long-form identifier:
mindat:1:1:55244:8
GUID
(UUID V4):
(UUID V4):
10312a4c-cbdc-4f24-809e-0c4100003e1b
IMA Classification of Grimmite
Approved
Approval year:
2020
First published:
2021
Classification of Grimmite
2.DA.
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
D : Metal Sulfides, M: S = 3 :4 and 2:3
A : M:S = 3:4
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
D : Metal Sulfides, M: S = 3 :4 and 2:3
A : M:S = 3:4
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Gmm | 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 Grimmite
Metallic
Transparency:
Opaque
Colour:
Grey with a pinkish tint
Hardness:
4½ - 5½ on Mohs scale
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
4.96 g/cm3 (Calculated)
Comment:
Caculated using empirical formula
Optical Data of Grimmite
Reflectivity:
| Wavelength | R |
|---|---|
| 400nm | 38.6% |
| 440nm | 41.1% |
| 470nm | 42.5% |
| 500nm | 43.7% |
| 546nm | 45.9% |
| 560nm | 46.5% |
| 589nm | 47.7% |
| 620nm | 48.9% |
| 650nm | 50.2% |
| 680nm | 51.3% |
| 700nm | 51.9% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 51.9%.
Colour in reflected light:
Creamy grey with a pinkish tint
Internal Reflections:
None
Pleochroism:
Not Visible
Chemistry of Grimmite
Mindat Formula:
NiCo2S4
Elements listed:
Crystallography of Grimmite
Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fd3m
Cell Parameters:
a = 9.3933(9) Å
Unit Cell V:
828.81 ų
Z:
8
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.321 Å | (75) |
| 2.712 Å | (7) |
| 2.348 Å | (81) |
| 2.155 Å | (6) |
| 1.917 Å | (27) |
| 1.660 Å | (100) |
| 1.485 Å | (11) |
| 1.356 Å | (15) |
Type Occurrence of Grimmite
General Appearance of Type Material:
Rare idiomorphic to hypidiomorphic grains up to 200 × 70 µm in size or veinlet aggregates.
Place of Conservation of Type Material:
Cotype material is deposited in the mineralogical collections of the Mining museum Příbram, Hynka Kličky Place 293, 26101 Příbram VI, Czech Republic, catalogue number 3/2020, and the Department of Mineralogy and Petrology, National Museum in Prague, Cirkusová 1740, 19300 Prague 9, Czech Republic, catalogue number P1P 49/2020
Geological Setting of Type Material:
In in siderite–sphalerite gangue in a uranium and base metal deposit.
Associated Minerals at Type Locality:
Reference:
Škácha, P., Sejkora, J., Plášil, J., Dolníček, Z., and Ulmanová, J. (2021) Grimmite, NiCo2S4, a new thiospinel from Příbram, Czech Republic. European Journal of Mineralogy: 33: 175–187.
Synonyms of Grimmite
Nickel Linnaeite (in part)
Other Language Names for Grimmite
German:Grimmit
Relationship of Grimmite to other Species
Member of:
Other Members of this group:
| Cadmoindite | CdIn2S4 | Iso. m3m (4/m 3 2/m) : Fd3m |
| Cuprorhodsite | (Cu1+0.5Fe3+0.5)Rh3+2S4 | Iso. m3m (4/m 3 2/m) : Fd3m |
| Daubréelite | Fe2+Cr3+2S4 | Iso. m3m (4/m 3 2/m) : Fd3m |
| Greigite | Fe2+Fe3+2S4 | Iso. m3m (4/m 3 2/m) : Fd3m |
| Indite | FeIn2S4 | Iso. m3m (4/m 3 2/m) : Fd3m |
| Joegoldsteinite | MnCr2S4 | Iso. m3m (4/m 3 2/m) : Fd3m |
| Kalininite | ZnCr2S4 | Iso. m3m (4/m 3 2/m) : Fd3m |
| Linnaeite | Co2+Co3+2S4 | Iso. m3m (4/m 3 2/m) : Fd3m |
| Polydymite | Ni2+Ni3+2S4 | Iso. m3m (4/m 3 2/m) : Fd3m |
| Siegenite | CoNi2S4 | Iso. m3m (4/m 3 2/m) : Fd3m |
| Tarkianite | (Cu,Fe)(Re,Mo)4S8 | Iso. 4 3m : F4 3m |
| Violarite | Fe2+Ni3+2S4 | Iso. m3m (4/m 3 2/m) : Fd3m |
| Xingzhongite | Pb2+Ir3+2S4 | Iso. |
Common Associates
Associated Minerals Based on Photo Data:
| 1 photo of Grimmite associated with Chalcopyrite | CuFeS2 |
| 1 photo of Grimmite associated with Skutterudite | CoAs3 |
| 1 photo of Grimmite associated with Ferroskutterudite | (Fe,Co)As3 |
| 1 photo of Grimmite associated with Cobaltite | CoAsS |
| 1 photo of Grimmite associated with Chamosite | (Fe2+)5Al(Si,Al)4O10(OH,O)8 |
| 1 photo of Grimmite associated with Erythrite | Co3(AsO4)2 · 8H2O |
| 1 photo of Grimmite associated with Quartz | SiO2 |
Related Minerals - Strunz-mindat Grouping
| 2.DA. | Zaykovite | Rh3Se4 |
| 2.DA. | Zolenskyite | FeCr2S4 |
| 2.DA. | Ezochiite | Cu+(Rh3+Pt4+)S4 |
| 2.DA. | Ferrodimolybdenite | FeMo2S4 |
| 2.DA.05 | Bornhardtite | Co2+Co3+2Se4 |
| 2.DA.05 | Carrollite | CuCo2S4 |
| 2.DA.05 | Cuproiridsite | (Cu,Fe)Ir2S4 |
| 2.DA.05 | Cuprorhodsite | (Cu1+0.5Fe3+0.5)Rh3+2S4 |
| 2.DA.05 | Daubréelite | Fe2+Cr3+2S4 |
| 2.DA.05 | Fletcherite | CuNi2S4 |
| 2.DA.05 | Florensovite | (Cu,Zn)Cr1.5Sb0.5S4 |
| 2.DA.05 | Greigite | Fe2+Fe3+2S4 |
| 2.DA.05 | Indite | FeIn2S4 |
| 2.DA.05 | Kalininite | ZnCr2S4 |
| 2.DA.05 | Linnaeite | Co2+Co3+2S4 |
| 2.DA.05 | Malanite | Cu1+(Ir3+Pt4+)S4 |
| 2.DA.05 | Polydymite | Ni2+Ni3+2S4 |
| 2.DA.05 | Siegenite | CoNi2S4 |
| 2.DA.05 | Trüstedtite | Ni3Se4 |
| 2.DA.05 | Tyrrellite | Cu(Co3+,Ni3+)2Se4 |
| 2.DA.05 | Violarite | Fe2+Ni3+2S4 |
| 2.DA.05 | Xingzhongite | Pb2+Ir3+2S4 |
| 2.DA.05 | Cadmoindite | CdIn2S4 |
| 2.DA.05 | Cuprokalininite | CuCr2S4 |
| 2.DA.05 | Joegoldsteinite | MnCr2S4 |
| 2.DA.05 | Nickeltyrrellite | CuNi2Se4 |
| 2.DA.10 | Rhodostannite | Cu1+(Fe2+0.5Sn4+1.5)S4 |
| 2.DA.10 | Toyohaite | Ag1+(Fe2+0.5Sn4+1.5)S4 |
| 2.DA.15 | Brezinaite | Cr3S4 |
| 2.DA.15 | Heideite | (Fe,Cr)1.15(Ti,Fe)2S4 |
| 2.DA.20 | Inaglyite | Cu3Pb(Ir,Pt)8S16 |
| 2.DA.20 | Konderite | Cu3Pb(Rh,Pt,Ir)8S16 |
| 2.DA.25 | Kingstonite | (Rh,Ir,Pt)3S4 |
Other Information
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 Grimmite
mindat.org URL:
https://www.mindat.org/min-55244.html
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References for Grimmite
Localities for Grimmite
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Atlantic Ocean | |
| Lee et al. (2002) |
Austria | |
| Girtler et al. (2015) +1 other reference |
Bulgaria | |
| Dragov et al. (1998) |
Canada | |
| Petruk et al. (1969) |
Czech Republic (TL) | |
| Miyawaki et al. (2020) +1 other reference |
| Dolníček et al. (2021) |
Finland | |
| A. J. Criddle & C. J. Stanley (1993) |
Germany | |
| SEM-EDS by Joy Desor |
Greece | |
| Rieck et al. (2022) |
Japan | |
| Imai et al. (1973) |
Spain | |
| Sainz de Baranda Graf et al. (2019) +1 other reference |
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El Entredicho Mine, Almadenejos, Ciudad Real, Castile-La Mancha, Spain