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Chegemite

A valid IMA mineral species
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05534430014949449285899.jpg
Chegemite

Xenolith no. 1, Lakargi Mountain, Upper Chegem volcanic caldera, Baksan Valley, Kabardino-Balkaria, Russia
02696030014949449285625.jpg
Chegemite, etc.

Xenolith no. 1, Lakargi Mountain, Upper Chegem volcanic caldera, Baksan Valley, Kabardino-Balkaria, Russia
05814870014949860757962.jpg
Chegemite

Lakargi Mountain, Upper Chegem volcanic caldera, Baksan Valley, Kabardino-Balkaria, Russia
06248330014948583632942.jpg
Chegemite

Xenolith no. 1, Lakargi Mountain, Upper Chegem volcanic caldera, Baksan Valley, Kabardino-Balkaria, Russia
08690670014948583638101.jpg
Chegemite, etc.

Xenolith no. 1, Lakargi Mountain, Upper Chegem volcanic caldera, Baksan Valley, Kabardino-Balkaria, Russia
00405960014948583644258.jpg
Chegemite

Lakargi Mountain, Upper Chegem volcanic caldera, Baksan Valley, Kabardino-Balkaria, Russia
05534430014949449285899.jpg
Chegemite

Xenolith no. 1, Lakargi Mountain, Upper Chegem volcanic caldera, Baksan Valley, Kabardino-Balkaria, Russia
02696030014949449285625.jpg
Chegemite, etc.

Xenolith no. 1, Lakargi Mountain, Upper Chegem volcanic caldera, Baksan Valley, Kabardino-Balkaria, Russia
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About ChegemiteHide

Formula:
Ca7(SiO4)3(OH)2
Colour:
Pink, yellow-pink to white.
Hardness:
5½ - 6
Specific Gravity:
2.86
Crystal System:
Orthorhombic
Name:
from the Chegem River where the new mineral was discovered in the headwater tributary-area
Ca- and OH-dominant analogue of Humite.
OH-analogue of Fluorchegemite.


Unique IdentifiersHide

Mindat ID:
39004
Long-form identifier:
mindat:1:1:39004:2
GUID
(UUID V4):
9024ac1d-f3a3-4e8c-8203-1e6ddd26d4fc

IMA Classification of ChegemiteHide

Classification of ChegemiteHide

Strunz-mindat (2024):
9.AF.

9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
CgmIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of ChegemiteHide

Colour:
Pink, yellow-pink to white.
Streak:
White
Hardness:
5½ - 6 on Mohs scale
Hardness:
VHN100=315 - Vickers
Cleavage:
Imperfect/Fair
(010)
Fracture:
Conchoidal
Density:
2.86(1) g/cm3 (Measured)    2.892 g/cm3 (Calculated)

Optical Data of ChegemiteHide

Type:
Biaxial
RI values:
nα = 1.621(2) nβ = 1.626(3) nγ = 1.630(2)
2V:
Measured: -81° (5), Calculated: -78°
Birefringence:
Max Birefringence:
δ = 0.009
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Optical Extinction:
X = a, Y = b, Z = c

Chemistry of ChegemiteHide

Mindat Formula:
Ca7(SiO4)3(OH)2
Elements listed:
Ca, H, O, Si - search for minerals with similar chemistry

Crystallography of ChegemiteHide

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 V:
1360.91 ų
Z:
4
Twinning:
Twins, probably on (110)
Comment:
space group Pbnm

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.611 Å(43)
3.646 Å(41)
3.041 Å(65)
2.837 Å(60)
2.728 Å(74)
2.557 Å(43)
2.520 Å(59)
1.910 Å(100)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 3a: Earth’s earliest Hadean crust>4.50
9 : Lava/xenolith minerals (hornfels, sanidinite facies)
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere<0.6
51 : Pyrometamorphic minerals (see also #54 and #56)<0.36

Type Occurrence of ChegemiteHide

Type Locality:
ⓘ Xenolith no. 1, Lakargi Mountain, Upper Chegem volcanic caldera (Verkhnechegemskaya caldera), Baksan Valley, Kabardino-Balkaria, Russia
General Appearance of Type Material:
Granular aggregates with grain sizes up to 5 mm.
Place of Conservation of Type Material:
Fersman Mineralogical Museum in Moscow, Russia, with the number 3731/1 and the single grain used for structural investigation is deposited in the Museum of Natural History in Bern, Switzerland, with the number NMBE 39571.
Geological Setting of Type Material:
A rock-forming mineral in high-temperature skarns (sanadinite) in calcareous xenoliths in ignimbrites.
Associated Minerals at Type Locality:
WadaliteSpurriteRondorfiteReinhardbraunsiteLarnite
LakargiiteKatoiteHillebrandite
Reference:
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.
Download:
https://rruff.info/rruff_1.0/uploads/EJM21_1045.pdf

Synonyms of ChegemiteHide

Relationship of Chegemite to other SpeciesHide

Member of:
Chegemite Subgroup > Humite Group
Other Members of this group:
EdgrewiteCa9(SiO4)4F2 Mon. 2/m : P21/b
FluorchegemiteCa7(SiO4)3F2 Orth. mmm (2/m 2/m 2/m)
HydroxyledgrewiteCa9(SiO4)4(OH)2 Mon. 2/m : P21/b
KumtyubeiteCa5(SiO4)2F2Mon. 2/m : P21/b
ReinhardbraunsiteCa5(SiO4)2(OH,F)2Mon. 2/m : P21/b
Forms a series with:
FluorchegemiteChegemite–Fluorchegemite

Common AssociatesHide

Associated Minerals Based on Photo Data:
3 photos of Chegemite associated with LarniteCa2SiO4
2 photos of Chegemite associated with HillebranditeCa2(SiO3)(OH)2
1 photo of Chegemite associated with Hydrogarnet
1 photo of Chegemite associated with RondorfiteCa8Mg(SiO4)4Cl2

Related Minerals - Strunz-mindat GroupingHide

9.AF.BarwooditeMn2+6Nb5+(SiO4)2O3(OH)3Trig. 3 : P3
9.AF.Jingwenite-(Y)YAlV4+(SiO4)O2(OH)2Mon. 2/m
9.AF.05SillimaniteAl2(SiO4)OOrth. mmm (2/m 2/m 2/m)
9.AF.05XenoliteAl10Si8O31
9.AF.10AndalusiteAl2(SiO4)OOrth. mmm (2/m 2/m 2/m) : Pnnm
9.AF.10KanonaiteMn3+Al(SiO4)OOrth. mmm (2/m 2/m 2/m) : Pnnm
9.AF.15KyaniteAl2(SiO4)OTric. 1 : P1
9.AF.20MulliteAl4+2xSi2-2xO10-xOrth. mmm (2/m 2/m 2/m) : Pbam
9.AF.20KrieseliteAl2(GeO4)F2Orth. mmm (2/m 2/m 2/m) : Pnma
9.AF.23BoromulliteAl9BSi2O19Orth. mm2 : Cmc21
9.AF.25YoderiteMg(Al,Fe3+)3(SiO4)2O(OH)Mon. 2/m : P21/m
9.AF.30MagnesiostauroliteMg(Mg,Li)3(Al,Mg)18Si8O44(OH)4Mon. 2/m : B2/m
9.AF.30StauroliteFe2+2Al9Si4O23(OH)Mon. 2/m : B2/m
9.AF.30ZincostauroliteZn2Al9Si4O23(OH)Mon. 2/m : B2/m
9.AF.35TopazAl2(SiO4)(F,OH)2Orth. mmm (2/m 2/m 2/m)
9.AF.40NorbergiteMg3(SiO4)F2Orth. mmm (2/m 2/m 2/m)
9.AF.45AlleghanyiteMn2+5(SiO4)2(OH)2Mon. 2/m : P21/b
9.AF.45ChondroditeMg5(SiO4)2F2Mon. 2/m : P21/b
9.AF.45ReinhardbraunsiteCa5(SiO4)2(OH,F)2Mon. 2/m : P21/b
9.AF.45KumtyubeiteCa5(SiO4)2F2Mon. 2/m : P21/b
9.AF.45HydroxylchondroditeMg5(SiO4)2(OH)2Mon. 2/m : P21/b
9.AF.50HumiteMg7(SiO4)3F2Orth. mmm (2/m 2/m 2/m) : Pnma
9.AF.50Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2Orth. mmm (2/m 2/m 2/m)
9.AF.50Unnamed (Ca-analogue of Humite)Ca7(SiO4)4F2Orth. mmm (2/m 2/m 2/m)
9.AF.50FluorchegemiteCa7(SiO4)3F2 Orth. mmm (2/m 2/m 2/m)
9.AF.50Unnamed (OH-analogue of humite)Mg7(SiO4)3(OH)2Orth.
9.AF.55ClinohumiteMg9(SiO4)4F2Mon. 2/m : P21/b
9.AF.55SonoliteMn2+9(SiO4)4(OH)2Mon. 2/m : P21/b
9.AF.55HydroxylclinohumiteMg9(SiO4)4(OH)2Mon. 2/m : P21/b
9.AF.60LeucophoeniciteMn2+7(SiO4)3(OH)2Mon. 2/m : P21/b
9.AF.65RibbeiteMn2+5(SiO4)2(OH)2Orth. mmm (2/m 2/m 2/m)
9.AF.70JerrygibbsiteMn2+9(SiO4)4(OH)2Orth. mmm (2/m 2/m 2/m) : Pbcn
9.AF.75FranciscaniteMn2+6(V5+,◻)2(SiO4)2(O,OH)6Trig. 3 : P3
9.AF.75ÖrebroiteMn2+3(Sb5+,Fe3+)(SiO4)(O,OH)3Trig. 3 : P3
9.AF.75WeliniteMn2+6(W6+,Mg)2(SiO4)2(O,OH)6Trig. 3 : P3
9.AF.75ScorticoiteMn6(Sb,◻)Σ2(SiO4)2O3(OH)3Trig. 3 : P3
9.AF.80EllenbergeriteMg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10Hex. 6 : P63
9.AF.85Chloritoid(Fe2+,Mg,Mn2+)Al2(SiO4)O(OH)2Mon. 2/m : B2/b
9.AF.85MagnesiochloritoidMgAl2(SiO4)O(OH)2Mon. 2/m : B2/b
9.AF.85Ottrélite(Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2Mon.
9.AF.90PoldervaartiteCaCa[SiO3(OH)](OH)Orth. mmm (2/m 2/m 2/m) : Pbca
9.AF.90OlmiiteCaMn2+[SiO3(OH)](OH)Orth. mmm (2/m 2/m 2/m) : Pbca
9.AF.95Pilawite-(Y)Ca2Y2Al4(SiO4)4O2(OH)2Mon. 2/m : P21/b

Other InformationHide

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 ChegemiteHide

References for ChegemiteHide

Localities for ChegemiteHide

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.

Locality ListHide

- 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.
Russia
 
  • Kabardino-Balkaria
    • Baksan Valley
Bailau +2 other references
        • Lakargi Mountain
Galuskin +9 other references
Galuskin +10 other references
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