Kerimasite (original) (raw)
Formula:
Ca3Zr2(SiO4)(Fe3+O4)2
Colour:
light to dark brown
Specific Gravity:
4.105 (Calculated)
Name:
Named for the Kerimasi volcano, Tanzania, the type locality.
Long-form identifier:
mindat:1:1:39563:0
85aeb65d-fb01-4c77-9e5e-1131e0636f96
9.AD.25
9 : SILICATES (Germanates)
A : Nesosilicates
D : Nesosilicates without additional anions; cations in [6] and/or greater coordination
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 |
Colour:
Light to dark brown
Hardness:
VHN25=1168 - 1288 kg/mm2 - Vickers
Density:
4.105(1) g/cm3 (Calculated)
Birefringence:
Isotropic minerals have no birefringence
Comments:
Yellowish-greenish colour
Optically heterogeneous, isotropic to anisotropic
Mindat Formula:
Ca3Zr2(SiO4)(Fe3+O4)2
Class (H-M):
m_3_m _(_4/_m_32/m ) - Hexoctahedral
Cell Parameters:
a = 12.549(1) Å
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| 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
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:
- Natural History Museum, London, UK (catalogue BM.1995,P6(47) and BM.1995,P6(22))
- 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.
Other Members of this group:
| Hutcheonite | Ca3Ti2(SiO4)(AlO4)2 | Iso. m_3_m _(_4/_m_32/m ) : I a_3_d |
|---|---|---|
| Irinarassite | Ca3Sn2(SiO4)(AlO4)2 | Iso. m_3_m _(_4/_m_32/m ) : I a_3_d |
| Kimzeyite | Ca3Zr2(SiO4)(AlO4)2 | Iso. m_3_m _(_4/_m_32/m ) : I a_3_d |
| Schorlomite | Ca3Ti2(SiO4)(Fe3+O4)2 | Iso. m_3_m _(_4/_m_32/m ) : I a_3_d |
| Toturite | Ca3Sn2(SiO4)(Fe3+O4)2 | Iso. m_3_m _(_4/_m_32/m ) : I a_3_d |
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.
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.
- 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.