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Chegemite

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Formula:
Ca
 
7
(SiO
 
4
)
 
3
(OH)
 
2
System:Orthorhombic
Member of:Chegemite series Group > Humite Group
Isostructural with:Alleghanyite, Chondrodite, Edgrewite, Hydroxylclinohumite, Jerrygibbsite, Kumtyubeite, Leucophoenicite, Manganhumite, Norbergite, Reinhardbraunsite, Ribbeite, Sonolite


Ca- and OH-dominant analogue of Humite.
OH-analogue of Unnamed (F-analogue of Chegemite).

Classification of Chegemite

IMA status:Approved 2008
mindat.org URL:http://www.mindat.org/min-39004.html
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Type Occurrence of Chegemite

Type Locality:Lakargi Mt., Verkhnechegemskaya caldera (Verkhni Chegem caldera; Upper Chegem caldera), Kabardino-Balkarian Republic, Northern Caucasus Region, Russia
Associated Minerals at type locality:
WadaliteSpurriteRondorfiteReinhardbraunsiteLarnite
LakargiiteKatoiteHillebrandite

Crystallography of Chegemite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:a = 5.0696(1) Å, b = 11.3955(1) Å, c = 23.557(3) Å
Ratio:a:b:c = 0.445 : 1 : 2.067
Unit Cell Volume:V 1360.91 ų
Z:4
Comment:space group Pbnm
X-Ray Powder Diffraction:
d-spacingIntensity
5.611 (43)
3.646 (41)
3.041 (65)
2.837 (60)
2.728 (74)
2.557 (43)
2.520 (59)
1.910 (100)

Chemical Properties of Chegemite

Formula:
Ca
 
7
(SiO
 
4
)
 
3
(OH)
 
2
Simplified for copy/paste:Ca7(SiO4)3(OH)2
Essential elements:Ca, H, O, Si
All elements listed in formula:Ca, H, O, Si

Relationship of Chegemite to other Species

Member of:Chegemite series Group > Humite Group
Other Members of Group:

- +
Edgrewite
Ca
 
9
(SiO
 
4
)
 
4
F
 
2
Kumtyubeite
Ca
 
5
(SiO
 
4
)
 
2
F
 
2
Reinhardbraunsite
Ca
 
5
(SiO
 
4
)
 
2
(OH,F)
 
2

Other Names for Chegemite

Synonyms:
IMA2008-038
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 Chegemite

Reference List:

- +
Galuskin, E. V.; Gazeev, V. M.; Lazic, B.; Armbruster, T.; Galuskina, I. O.; Zadov, A. E.; Pertsev, N. N.; Wrzalik, R.; Dzierzanowski, P.; Gurbanov, A. G. & Bzowska, G. (2009): Chegemite Ca7(SiO4)3(OH)2 - a new humite-group calcium mineral from the Northern Caucasus, Kabardino-Balkaria, Russia. European Journal of Mineralogy 21, 1045-1059.

Best Localities for Chegemite

Best of Species:Chegemite

Internet Links for Chegemite

Search Engines:
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  • External Links:
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  • Look for Chegemite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Localities for Chegemite

    The 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.
    (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.
    Russia
     
    • Northern Caucasus Region
      • Kabardino-Balkarian Republic
        • Verkhnechegemskaya caldera (Verkhni Chegem caldera; Upper Chegem caldera)
    European J. Min. 21,1045(2009)
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