Kerimasite
A valid IMA mineral species
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About Kerimasite
Formula:
Ca3Zr2(SiO4)(Fe3+O4)2
Colour:
light to dark brown
Lustre:
Vitreous
Hardness:
7
Specific Gravity:
4.105 (Calculated)
Crystal System:
Isometric
Member of:
Name:
Named for the Kerimasi volcano, Tanzania, the type locality.
Type Locality:
Unique Identifiers
Mindat ID:
39563
Long-form identifier:
mindat:1:1:39563:0
GUID
(UUID V4):
(UUID V4):
85aeb65d-fb01-4c77-9e5e-1131e0636f96
IMA Classification of Kerimasite
Approved
IMA Formula:
Ca3Zr2(SiFe3+2)O12
Approval year:
2009
First published:
2010
Type description reference:
Zaitsev, A. N., Williams, C. T., Britvin, S. N., Kuznetsova, I. V., Spratt, J., Petrov, S. V., Keller, J. (2010) Kerimasite, Ca3Zr2(Fe23+Si)O12, a new garnet from carbonatites of Kerimasi volcano and surrounding explosion craters, northern Tanzania. Mineralogical Magazine, 74 (5) 803-820 doi:10.1180/minmag.2010.074.5.803
Classification of Kerimasite
9.AD.25
9 : SILICATES (Germanates)
A : Nesosilicates
D : Nesosilicates without additional anions; cations in [6] and/or greater coordination
9 : SILICATES (Germanates)
A : Nesosilicates
D : Nesosilicates without additional anions; cations in [6] and/or greater coordination
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 |
---|---|---|
Kms | 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 Kerimasite
Vitreous
Transparency:
Transparent
Colour:
light to dark brown
Hardness:
7 on Mohs scale
Hardness:
VHN25=1168 - 1288 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
Not observed.
Density:
4.105(1) g/cm3 (Calculated)
Optical Data of Kerimasite
Type:
Isotropic
RI values:
n = 1.945(5)
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Very High
Comments:
Yellowish-greenish colour
Optically heterogeneous, isotropic to anisotropic
Optically heterogeneous, isotropic to anisotropic
Chemistry of Kerimasite
Mindat Formula:
Ca3Zr2(SiO4)(Fe3+O4)2
Crystallography of Kerimasite
Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Ia3d
Setting:
Ia3d
Cell Parameters:
a = 12.549(1) Å
Unit Cell V:
1976.2 ų
Z:
8
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0014052 | Kerimasite | Whittle K R, Lumpkin G R, Berry F J, Oates G, Smith K L, Yudintsev S, Zaluzec N J (2007) The structure and ordering of zirconium and hafnium containing garnets studied by electron channelling, neutron diffraction and Mossbauer spectroscopy Journal of Solid State Chemistry 180 785-791 | 2007 | synthetic | 0 | 293 | |
0014052 | Kerimasite | Whittle K R, Lumpkin G R, Berry F J, Oates G, Smith K L, Yudintsev S, Zaluzec N J (2007) The structure and ordering of zirconium and hafnium containing garnets studied by electron channelling, neutron diffraction and Mossbauer spectroscopy Journal of Solid State Chemistry 180 785-791 | 2007 | synthetic | 0 | 293 | |
0018324 | Kerimasite | Zaitsev A N, Williams C T, Britvin S N, Kuznetsova I V, Spratt J, Petrov S V, Keller J (2010) Kerimasite, Ca3Zr2(Fe3+2Si)O12, a new garnet from carbonatites of Kerimasi volcano and surrounding explosion craters, northern Tanzania Mineralogical Magazine 74 803-820 | 2010 | Kerimasi volcano, Tanzania | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
4.441 Å | (41) |
3.140 Å | (91) |
2.808 Å | (70) |
2.564 Å | (93) |
1.985 Å | (21) |
1.741 Å | (26) |
1.677 Å | (100) |
1.403 Å | (17) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
36 : Carbonatites, kimberlites, and related igneous rocks |
Type Occurrence of Kerimasite
General Appearance of Type Material:
subhedral crystals up to 100 µm in calcite carbonatites; euhedral to subhedral crystals up to 180 µm in carbonatite eluvium.
Place of Conservation of Type Material:
1) Natural History Museum, London, UK (catalogue BM.1995,P6(47) and BM.1995,P6(22))
2) Mineralogical Museum, Department of Mineralogy, Faculty of Geology, St. Petersburg State University, St. Petersburg, Russia (catalogue number 1/19363)
2) Mineralogical Museum, Department of Mineralogy, Faculty of Geology, St. Petersburg State University, St. Petersburg, Russia (catalogue number 1/19363)
Geological Setting of Type Material:
Calcite carbonatites; carbonatite eluvium.
Associated Minerals at Type Locality:
Reference:
Zaitsev, A.N., Williams, C.T., Britvin, S.N., Kuznetsova, I.V., Spratt, J., Petrov, S.V., and Keller, J. (2010) Kerimasite, Ca3Zr2(Fe3+2Si)O12, a new garnet from carbonatites of Kerimasi volcano and surrounding explosion craters, northern Tanzania. Mineralogical Magazine: 74(5): 803-820.
Synonyms of Kerimasite
Other Language Names for Kerimasite
Relationship of Kerimasite to other Species
Member of:
Other Members of this group:
Hutcheonite | Ca3Ti2(SiO4)(AlO4)2 | Iso. m3m (4/m 3 2/m) : Ia3d |
Irinarassite | Ca3Sn2(SiO4)(AlO4)2 | Iso. m3m (4/m 3 2/m) : Ia3d |
Kimzeyite | Ca3Zr2(SiO4)(AlO4)2 | Iso. m3m (4/m 3 2/m) : Ia3d |
Schorlomite | Ca3Ti2(SiO4)(Fe3+O4)2 | Iso. m3m (4/m 3 2/m) : Ia3d |
Toturite | Ca3Sn2(SiO4)(Fe3+O4)2 | Iso. m3m (4/m 3 2/m) : Ia3d |
Common Associates
Associated Minerals Based on Photo Data:
1 photo of Kerimasite associated with Perovskite | CaTiO3 |
Related Minerals - Strunz-mindat Grouping
9.AD. | Adrianite | Ca12(Al4Mg3Si7)O32Cl6 |
9.AD.05 | Larnite | Ca2SiO4 |
9.AD.10 | Calcio-olivine | Ca2SiO4 |
9.AD.15 | Merwinite | Ca3Mg(SiO4)2 |
9.AD.20 | Bredigite | Ca7Mg(SiO4)4 |
9.AD.25 | Andradite | Ca3Fe3+2(SiO4)3 |
9.AD.25 | Almandine | Fe2+3Al2(SiO4)3 |
9.AD.25 | Calderite | Mn2+3Fe3+2(SiO4)3 |
9.AD.25 | Goldmanite | Ca3V3+2(SiO4)3 |
9.AD.25 | Grossular | Ca3Al2(SiO4)3 |
9.AD.25 | Henritermierite | Ca3Mn3+2(SiO4)2[◻(OH)4] |
9.AD.25 | Kimzeyite | Ca3Zr2(SiO4)(AlO4)2 |
9.AD.25 | Knorringite | Mg3Cr2(SiO4)3 |
9.AD.25 | Majorite | Mg3(MgSi)(SiO4)3 |
9.AD.25 | Morimotoite | Ca3(TiFe2+)(SiO4)3 |
9.AD.25 | Pyrope | Mg3Al2(SiO4)3 |
9.AD.25 | Schorlomite | Ca3Ti2(SiO4)(Fe3+O4)2 |
9.AD.25 | Spessartine | Mn2+3Al2(SiO4)3 |
9.AD.25 | Uvarovite | Ca3Cr2(SiO4)3 |
9.AD.25 | Wadalite | (Ca,Mg)6(Al,Fe3+)4((Si,Al)O4)3O4Cl3 |
9.AD.25 va | Hydrougrandite | (Ca,Mg,Fe2+)3(Fe3+,Al)2[(OH)4(SiO4)2] |
9.AD.25 va | Yamatoite | (Mn2+,Ca)3(V3+,Al)2(SiO4)3 |
9.AD.25 | Holtstamite | Ca3Al2(SiO4)2[◻(OH)4] |
9.AD.25 | Khoharite | Mg3Fe3+2(SiO4)3 |
9.AD.25 | Toturite | Ca3Sn2(SiO4)(Fe3+O4)2 |
9.AD.25 | Momoiite | Mn2+3V3+2(SiO4)3 |
9.AD.25 | Eringaite | Ca3Sc2(SiO4)3 |
9.AD.25 | Irinarassite | Ca3Sn2(SiO4)(AlO4)2 |
9.AD.25 | Menzerite-(Y) | (Y2Ca)Mg2(SiO4)3 |
9.AD.25 | Eltyubyuite | Ca12Fe3+10Si4O32Cl6 |
9.AD.25 | Blythite | Mn2+3Mn3+2[SiO4]3 |
9.AD.25 | Skiagite | Fe2+3Fe3+2[SiO4]3 |
9.AD.25 | Hutcheonite | Ca3Ti2(SiO4)(AlO4)2 |
9.AD.25 | UM1984-37-SiO:CrMn | Mn2+3Cr3+2(SiO4)3 |
9.AD.25 | Rubinite | Ca3Ti3+2Si3O12 |
9.AD.25 | Nikmelnikovite | Ca12(Fe2+Fe3+3Al3◻)[SiO4]6[◻(OH)4]5◻4 |
9.AD.30 va | Auerlite | near Th(Si,P)O4 |
9.AD.30 | Coffinite | U(SiO4) · nH2O |
9.AD.30 | Hafnon | HfSiO4 |
9.AD.30 | Thorite | Th(SiO4) |
9.AD.30 | Zircon | Zr(SiO4) |
9.AD.30 | Stetindite-(Ce) | Ce(SiO4) |
9.AD.35 | Huttonite | ThSiO4 |
9.AD.35 | Tombarthite-(Y) | Y4(Si,H4)4O12-x(OH)4+2x |
9.AD.40 | Eulytine | Bi4(SiO4)3 |
9.AD.45 | Reidite | ZrSiO4 |
9.AD.55 | Jeffbenite | Mg3Al2Si3O12 |
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 Kerimasite
mindat.org URL:
https://www.mindat.org/min-39563.html
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References for Kerimasite
Reference List:
Zaitsev, A. N., Williams, C. T., Britvin, S. N., Kuznetsova, I. V., Spratt, J., Petrov, S. V., Keller, J. (2010) Kerimasite, Ca3Zr2(Fe23+Si)O12, a new garnet from carbonatites of Kerimasi volcano and surrounding explosion craters, northern Tanzania. Mineralogical Magazine, 74 (5) 803-820 doi:10.1180/minmag.2010.074.5.803
Localities for Kerimasite
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).
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.
All localities listed without proper references should be considered as questionable.
Germany | |
| EMPA data |
Galuskin et al. (2016) | |
in the collection of Christof Schäfer | |
in the collection of Christof Schäfer | |
in the collection of Christof Schäfer | |
| Blaß et al. (2014) |
Israel | |
| doi:10.3390/min8030109. +1 other reference |
Russia | |
| Lazic et al. (2011) |
| Bailau +1 other reference |
| Galuskina et al. (2015) |
Galuskin et al. (2011) | |
Galuskina et al. (2013) | |
Slovakia | |
| Uher P. et al. (2012) +1 other reference |
Tanzania (TL) | |
| Zaitsev et al. (2010) |
Zaitsev et al. (2010) | |
Zaitsev et al. (2010) | |
USA | |
| Mikail Murashko |
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Magnet Cove, Hot Spring County, Arkansas, USA