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Kerimasite

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Formula:
Ca
 
3
Zr
 
2
(SiO
 
4
)(Fe
3+
 
O
 
4
)
 
2
System:Isometric
Member of:Garnet Structural Group


Ferric iron analogue of kimzeyite and Zr-analogue of toturite.

Classification of Kerimasite

IMA status:Approved 2009
Nickel-Strunz 10th (pending) edition ID:9.AD.25

9 : SILICATES (Germanates)
A : Nesosilicates
D : Nesosilicates without additional anions; cations in [6] and/or greater coordination
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Type Occurrence of Kerimasite

Type Locality:Kerimasi volcano, Arusha Region, Tanzania
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.

Physical Properties of Kerimasite

Hardness (Vickers):VHN25=1168 - 1288 kg/mm2
Tenacity:Brittle
Cleavage:None Observed
Parting:Not observed.
Density (calculated):4.105(1) g/cm3

Crystallography of Kerimasite

Crystal System:Isometric
Class (H-M):m3m (4/m 3 2/m) - Hexoctahedral
Space Group:Ia3d {I41/a 3 2/d}
Cell Parameters:a = 12.549(1) Å
Unit Cell Volume:V 1976.2 ų
Z:8
X-Ray Powder Diffraction:
d-spacingIntensity
4.441 (41)
3.140 (91)
2.808 (70)
2.564 (93)
1.985 (21)
1.741 (26)
1.677 (100)
1.403 (17)

Optical Data of Kerimasite

Type:Isotropic
RI values: n = 1.945(5)
Maximum Birefringence:δ = 0.000 - Isotropic minerals have no birefringence
Surface Relief:Very High

Chemical Properties of Kerimasite

Formula:
Ca
 
3
Zr
 
2
(SiO
 
4
)(Fe
3+
 
O
 
4
)
 
2
Essential elements:Ca, Fe, O, Si, Zr
All elements listed in formula:Ca, Fe, O, Si, Zr
Analytical Data:Average chemical formula derived from electron microprobe analyses, and calculated for 12 oxygen atoms per formula unit and all Fe as Fe2O3.
Empirical Formula:
(Ca
 
3.00
Mn
 
0.01
Ce
 
0.01
Nd
 
0.01
)Σ3.03(Zr
 
1.72
Nb
 
0.14
Ti
 
0.08
Mg
 
0.02
Y
 
0.02
)Σ1.98(Fe
3+
1.23
Si
 
0.86
Al
 
0.82
Ti
 
0.09
)Σ3.00O
 
12
Relationship of Kerimasite to other Species
Member of:Garnet Structural Group
Other Members of Group:

- + 
Almandine
Fe
2+
3
Al
 
2
(SiO
 
4
)
 
3
Andradite
Ca
 
3
Fe
3+
2
(SiO
 
4
)
 
3
Berzeliite
NaCa
 
2
(Mg,Mn
2+
 
)
 
2
(AsO
 
4
)
 
3
Bitikleite-(SnAl)
Ca
 
3
SbSn(AlO
 
4
)
 
3
Bitikleite-(SnFe)
Ca
 
3
SbSn(Fe
3+
 
O
 
4
)
 
3
Bitikleite-(ZrFe)
Ca
 
3
SbZr(Fe
3+
 
O
 
4
)
 
3
Blythite
Mn
2+
3
Mn
3+
2
[SiO
 
4
]
 
3
Calderite
(Mn
2+
 
,Ca)
 
3
(Fe
3+
 
,Al)
 
2
(SiO
 
4
)
 
3
Goldmanite
Ca
 
3
V
3+
2
(SiO
 
4
)
 
3
Grossular
Ca
 
3
Al
 
2
(SiO
 
4
)
 
3
Henritermierite
Ca
 
3
(Mn
3+
 
,Al)
 
2
(SiO
 
4
)
 
2
(OH)
 
4
Irinarassite
Ca
 
3
Sn
 
2
Al
 
2
SiO
 
12
 
Katoite
Ca
 
3
Al
 
2
(SiO
 
4
)
 
3-x
(OH)
 
4x
Kimzeyite
Ca
 
3
(Zr,Ti)
 
2
((Si,Al,Fe
3+
 
)O
 
4
)
 
3
Knorringite
Mg
 
3
Cr
 
2
(SiO
 
4
)
 
3
Majorite
Mg
 
3
(Fe
2+
 
,Si,Al)
 
2
(SiO
 
4
)
 
3
Menzerite-(Y)
{(Y,REE)(Ca,Fe
2+
 
)
 
2
}[(Mg,Fe
2+
 
)(Fe
3+
 
,Al)]
 
2
[SiO
 
4
]
 
3
Momoiite
(Mn
2+
 
,Ca)
 
3
V
3+
2
(SiO
 
4
)
 
3
Morimotoite
Ca
 
3
(Ti,Fe
2+
 
,Fe
3+
 
)
 
2
((Si,Fe
3+
 
)O
 
4
)
 
3
Palenzonaite
(Ca,Na)
 
3
CaMn
2+
2
(VO
 
4
)
 
3
Pyrope
Mg
 
3
Al
 
2
(SiO
 
4
)
 
3
Schäferite
Ca
 
2
NaMg
 
2
(VO
 
4
)
 
3
Schorlomite
Ca
 
3
(Ti,Fe
3+
 
)
 
2
((Si,Fe
3+
 
)O
 
4
)
 
3
Skiagite
Fe
2+
3
Fe
3+
2
[SiO
 
4
]
 
3
Spessartine
Mn
2+
3
Al
 
2
(SiO
 
4
)
 
3
Toturite
Ca
 
3
Sn
 
2
(SiO
 
4
)(Fe
3+
 
O
 
4
)
 
2
Uvarovite
Ca
 
3
Cr
 
2
(SiO
 
4
)
 
3
Yafsoanite
Ca
 
3
Zn
 
3
(TeO
 
6
)
 
2
Related Minerals - Nickel-Strunz Grouping):

- + 
9.AD.05Larnite
Ca
 
2
SiO
 
4
9.AD.10Calcio-Olivine
Ca
 
2
SiO
 
4
9.AD.15Merwinite
Ca
 
3
Mg(SiO
 
4
)
 
2
9.AD.20Bredigite
Ca
 
7
Mg(SiO
 
4
)
 
4
9.AD.25Andradite
Ca
 
3
Fe
3+
2
(SiO
 
4
)
 
3
9.AD.25Almandine
Fe
2+
3
Al
 
2
(SiO
 
4
)
 
3
9.AD.25Calderite
(Mn
2+
 
,Ca)
 
3
(Fe
3+
 
,Al)
 
2
(SiO
 
4
)
 
3
9.AD.25Goldmanite
Ca
 
3
V
3+
2
(SiO
 
4
)
 
3
9.AD.25Grossular
Ca
 
3
Al
 
2
(SiO
 
4
)
 
3
9.AD.25Henritermierite
Ca
 
3
(Mn
3+
 
,Al)
 
2
(SiO
 
4
)
 
2
(OH)
 
4
9.AD.25Hibschite
Ca
 
3
Al
 
2
(SiO
 
4
)
 
3-x
(OH)
 
4x
9.AD.25Hydroandradite
Ca
 
3
Fe
3+
2
(SiO
 
4
)
 
3-x
(OH)
 
4x
9.AD.25Katoite
Ca
 
3
Al
 
2
(SiO
 
4
)
 
3-x
(OH)
 
4x
9.AD.25Kimzeyite
Ca
 
3
(Zr,Ti)
 
2
((Si,Al,Fe
3+
 
)O
 
4
)
 
3
9.AD.25Knorringite
Mg
 
3
Cr
 
2
(SiO
 
4
)
 
3
9.AD.25Majorite
Mg
 
3
(Fe
2+
 
,Si,Al)
 
2
(SiO
 
4
)
 
3
9.AD.25Morimotoite
Ca
 
3
(Ti,Fe
2+
 
,Fe
3+
 
)
 
2
((Si,Fe
3+
 
)O
 
4
)
 
3
9.AD.25Pyrope
Mg
 
3
Al
 
2
(SiO
 
4
)
 
3
9.AD.25Schorlomite
Ca
 
3
(Ti,Fe
3+
 
)
 
2
((Si,Fe
3+
 
)O
 
4
)
 
3
9.AD.25Spessartine
Mn
2+
3
Al
 
2
(SiO
 
4
)
 
3
9.AD.25Uvarovite
Ca
 
3
Cr
 
2
(SiO
 
4
)
 
3
9.AD.25Wadalite
(Ca,Mg)
 
6
(Al,Fe
3+
 
)
 
4
((Si,Al)O
 
4
)
 
3
O
 
4
Cl
 
3
9.AD.25Holtstamite
Ca
 
3
(Al,Mn
3+
 
)
 
2
(SiO
 
4
)
 
2
(OH)
 
4
9.AD.25Toturite
Ca
 
3
Sn
 
2
(SiO
 
4
)(Fe
3+
 
O
 
4
)
 
2
9.AD.25Momoiite
(Mn
2+
 
,Ca)
 
3
V
3+
2
(SiO
 
4
)
 
3
9.AD.30Coffinite
(U
4+
 
,Th)(SiO
 
4
)
 
1-x
(OH)
 
4x
9.AD.30Hafnon
HfSiO
 
4
9.AD.30Thorite
(Th,U)SiO
 
4
9.AD.30Thorogummite
(Th,U)(SiO
 
4
)
 
1-x
(OH)
 
4x
9.AD.30Zircon
ZrSiO
 
4
9.AD.30Stetindite
Ce
4+
 
SiO
 
4
9.AD.35Huttonite
ThSiO
 
4
9.AD.35Tombarthite-(Y)
Y
 
4
(Si,H
 
4
)
 
4
O
 
12-x
(OH)
 
4+2x
9.AD.40Eulytine
Bi
 
4
(SiO
 
4
)
 
3
9.AD.45Reidite
ZrSiO
 
4
Other Names for Kerimasite
Synonyms:
IMA2009-029
Other Languages:
Other Information
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
References for Kerimasite
Reference List:

- + 
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.
Internet Links for Kerimasite
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    • Localities for Kerimasite
    






    


    

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the  symbol to view information about a locality. 
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    (TL) indicates type locality.  ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.

    Germany
     
    

    • Rhineland-Palatinate
    

      • Eifel
    

        • Mayen
    

          • Ettringen
    

            • Bellerberg volcano
    
    		EMPA data, Sharygin V.V. 
    Russia
     
    

    • Northern Caucasus Region
    

      • Kabardino-Balkarian Republic
    

        • Verkhnechegemskaya caldera (Verkhni Chegem caldera; Upper Chegem caldera)
    
    		Galuskina, I.O., Galuskin, E.V., Dzierzanowski, P., Gazeev, V.M., Prusik, K., Pertsev, N.N., Winiarski, A., Zadov, A.E., and Wrzalik, R. (2010): American Mineralogist 95(8-9), 1305-1311.
    Slovakia
     
    

    • Banská Bystrica Region
    

      • Banská Štiavnica Co.
    

        • Vysoká
    
    		Uher P., Koděra P., Ozdín D. (2012): Kerimasit Ca3Zr2(Fe3+2Si)O12-vzácny granát z Ca-Mg skarnovo-porfýrového ložiska Vysoká-Zlatno, štiavnický stratovulkán (stredné Slovensko). Bull. mineral.-petrolog. Odd. Nár. Muz. (Praha) 20, 1, 59-62.
    Tanzania
     
    

    • Arusha Region
    
    		Zaitsev, A.N., Williams, C.T., Britvin, S.N., Kuznetsova, I.V., Spratt, J., Petrov, S.V., and Keller, J. (2010): Mineralogical Magazine 74(5), 803-820.
    


    


    

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