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Kodamaite

A valid IMA mineral species
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09582680017271996932253.jpg
Kodamaite, etc.

Demix-Varennes quarry, Saint-Amable sill, Varennes & St-Amable, Lajemmerais RCM, Montérégie, Québec, Canada
09772680017272473248490.jpg
Kodamaite, etc.

Demix-Varennes quarry, Saint-Amable sill, Varennes & St-Amable, Lajemmerais RCM, Montérégie, Québec, Canada
09559730017272038057006.jpg
Kodamaite, etc.

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
09598980017272473258377.jpg
Kodamaite, etc.

Demix-Varennes quarry, Saint-Amable sill, Varennes & St-Amable, Lajemmerais RCM, Montérégie, Québec, Canada
09772680017272473248490.jpg
Kodamaite, etc.

Demix-Varennes quarry, Saint-Amable sill, Varennes & St-Amable, Lajemmerais RCM, Montérégie, Québec, Canada
09559730017272038057006.jpg
Kodamaite, etc.

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
09582680017271996932253.jpg
Kodamaite, etc.

Demix-Varennes quarry, Saint-Amable sill, Varennes & St-Amable, Lajemmerais RCM, Montérégie, Québec, Canada
08351100017272473266376.jpg
Kodamaite, etc.

Demix-Varennes quarry, Saint-Amable sill, Varennes & St-Amable, Lajemmerais RCM, Montérégie, Québec, Canada
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About KodamaiteHide

Formula:
Na3(Ca5Na)Si16O36(OH)4F2 · (14-x)H2O
x ≈ 5
Colour:
tan to creamy-yellow to white in color, less often being colorless, light or dark green, or white.
Lustre:
Vitreous, Silky
Hardness:
2
Specific Gravity:
2.16 (Calculated)
Crystal System:
Triclinic
Member of:
Reyerite Group
Similar to ellingsenite.


Unique IdentifiersHide

Mindat ID:
53862
Long-form identifier:
mindat:1:1:53862:4

IMA Classification of KodamaiteHide

IMA status:
Approved
IMA Formula:
Na3(Ca5Na)Si16O36(OH)4F2 · (14-x)H2O (x ≈ 5)
Approval year:
2019

Classification of KodamaiteHide

Strunz-mindat (2025):
9.EE.35

9 : SILICATES (Germanates)
E : Phyllosilicates
E : Single tetrahedral nets of 6-membered rings connected by octahedral nets or octahedral bands

Mineral SymbolsHide

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

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

Physical Properties of KodamaiteHide

Lustre:
Vitreous, Silky
Transparency:
Transparent, Translucent
Colour:
Tan to creamy-yellow to white in color, less often being colorless, light or dark green, or white.
Streak:
White
Hardness:
2 on Mohs scale
Tenacity:
Sectile
Cleavage:
Perfect
{001}
Comment:
smooth fracture
Density:
2.16 g/cm3 (Calculated)

Optical Data of KodamaiteHide

Type:
Biaxial
Pleochroism:
Non-pleochroic
Comments:
An average nD = 1.507 (for λ = 590 nm) was calculated using data from the refined crystal structure.

Chemistry of KodamaiteHide

Mindat Formula:
Na3(Ca5Na)Si16O36(OH)4F2 · (14-x)H2O

x ≈ 5
Element Weights:
Element% weight
O45.499 %
Si31.169 %
Ca13.899 %
Na6.378 %
F2.636 %
H0.420 %

Calculated from ideal end-member formula.
Elements listed:
Ca, F, H, Na, O, Si - search for minerals with similar chemistry

Crystallography of KodamaiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 9.609(2) Å, b = 9.630(2) Å, c = 15.739(3) Å
α = 75.21(3)°, β = 75.21(3)°, γ = 60.12(3)°
Ratio:
a:b:c = 0.998 : 1 : 1.634
Unit Cell V:
1,206.63 ų (Calculated from Unit Cell)
Z:
1

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
15.148 Å(100)
4.191 Å(5)
3.833 Å(7)
3.139 Å(5)
3.068 Å(7)
2.996 Å(18)
2.780 Å(14)
1.831 Å(9)
Locality:
Poudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
Comments:
From Type Description.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
35 : Ultra-alkali and agpaitic igneous rocks

Type Occurrence of KodamaiteHide

Type Locality:
ⓘ Poudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
General Appearance of Type Material:
Develops in spherulitic aggregates up to ∼2 mm across, comprising thin, platy to bladed crystals, with individual crystals averaging <0.05 × 0.5 mm.
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Canadian Museum of Nature, P.O. Box 3443, Station D, Ottawa, Ontario K1P 6P4, Canada, catalogue number CMNMC 87262.
Associated Minerals at Type Locality:
AegirineAlbiteCatapleiiteClinoamphiboleErdite
FluorapatiteFluoriteMicroclineMolybdeniteNatrolite
PyritePyrochlore GroupRinkite GroupSodaliteVilliaumite

Synonyms of KodamaiteHide

Other Language Names for KodamaiteHide

Dutch:Kodamaiet
German:Kodamait

Relationship of Kodamaite to other SpeciesHide

Member of:
Reyerite Group
Other Members of Reyerite Group:
Minehillite(K,Na)2-3Ca28Zn4Al4Si40O112(OH)16Hex.
Reyerite(Na,K)2Ca14(Si,Al)24O58(OH)8 · 6H2OTrig. 3 : P3
Truscottite(Ca,Mn)14Si24O58(OH)8 · 2H2OTrig.

Common AssociatesHide

Associated Minerals Based on Photo Data:
14 photos of Kodamaite associated with VarennesiteNa8Mn2Si10O25(OH,Cl)2 · 12H2O
10 photos of Kodamaite associated with Sazhinite
7 photos of Kodamaite associated with NatroliteNa2Al2Si3O10 · 2H2O
2 photos of Kodamaite associated with Eudialyte Group[N(1)N(2)N(3)N(4)N(5)]3[M(1.1)M(1.2)]3[M(2.1)M(2.2)M(2.3)]3-6[M(3)M(4)]Z3[Si24O72]Θ4X(1)X(2)
1 photo of Kodamaite associated with AegirineNaFe3+Si2O6
1 photo of Kodamaite associated with SphaleriteZnS
1 photo of Kodamaite associated with ZakharoviteNa4Mn5Si10O24(OH)6 · 6H2O

Related Minerals - Strunz-mindat GroupingHide

9.EE.CairncrossiteSr2Ca7-xNa2x(Si4O10)4(OH)2(H2O)15-xTric. 1 : P1
9.EE.05BementiteMn7Si6O15(OH)8Mon.
9.EE.07InnsbruckiteMn33(Si2O5)14(OH)38Mon. m : Bm
9.EE.10BrokenhilliteMn8Si6O15(OH)10Hex. 6mm : P63mc
9.EE.10Mcgillite(Mn,Fe)8Si6O15(OH)8Cl2Mon. 2/m : B2/m
9.EE.10FriedeliteMn2+8Si6O15(OH,Cl)10Mon. 2/m : B2/m
9.EE.10Pyrosmalite-(Mn)Mn2+8Si6O15(OH,Cl)10Trig. 3m (3 2/m) : P3m1
9.EE.10Pyrosmalite-(Fe)Fe2+8Si6O15(OH,Cl)10Trig. 3m (3 2/m) : P3m1
9.EE.15Nelenite(Mn,Fe)16(Si12O30)(OH)14[As3+3O6(OH)3]Trig. 3m (3 2/m) : R3m
9.EE.15SchalleriteMn2+16As3Si12O36(OH)17Trig. 3m : P3m1
9.EE.20Palygorskite◻Al2Mg2◻2Si8O20(OH)2(H2O)4 · 4H2OMon. 2/m : B2/m
9.EE.20YofortieriteMn2+Mn2+2Mn2+2◻2Si8O20(OH)2(H2O)4 · 4H2OMon. 2/m : B2/m
9.EE.20WindhoekiteFe3+(Fe3+1.67◻0.33)Ca2◻2Si8O20(OH)2(H2O)4(OH)2 · 6H2OMon. 2/m : B2/m
9.EE.20Windmountainite◻Fe3+2Mg2◻2Si8O20(OH)2(H2O)4 · 4H2OMon. 2/m : B2/m
9.EE.20IkorskyiteKMn3+(Si4O10) · 3H2OMon. 2/m : P21/b
9.EE.20TuperssuatsiaiteFe3+Fe3+2(Na◻)◻2Si8O20(OH)2(H2O)4 · 2H2OMon. 2/m : B2/m
9.EE.20Unnamed (Na-Ca-Fe-Silicate-Hydrate)NaCa(Fe2+,Al,Mn)5[Si8O19(OH)](OH)7 · 5H2OTric. 1 : P1
9.EE.25SepioliteMg4(Si6O15)(OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m) : Pnna
9.EE.25LoughliniteNa2Mg3Si6O16 · 8H2OOrth. mmm (2/m 2/m 2/m)
9.EE.25Falcondoite(Ni,Mg)4Si6O15(OH)2 · 6H2OOrth.
9.EE.25Kalifersite(K,Na)5Fe3+7Si20O50(OH)6 · 12H2OTric. 1 : P1
9.EE.30OrlymaniteCa4Mn3Si8O20(OH)6 · 2H2OHex.
9.EE.30TungusiteCa4Fe2Si6O15(OH)6Tric. 1 : P1
9.EE.30GyroliteNaCa16Si23AlO60(OH)8 · 14H2OTric. 1 : P1
9.EE.35Reyerite(Na,K)2Ca14(Si,Al)24O58(OH)8 · 6H2OTrig. 3 : P3
9.EE.35Truscottite(Ca,Mn)14Si24O58(OH)8 · 2H2OTrig.
9.EE.40NatrosiliteNa2Si2O5Mon. 2/m : P21/b
9.EE.45MakatiteNa2Si4O8(OH)2 · 4H2OMon. 2/m : P21/b
9.EE.50VarennesiteNa8Mn2Si10O25(OH,Cl)2 · 12H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
9.EE.55RaiteMn2+Mn2+2Na2(◻1.75Ti0.25)Si8O20(OH)2(H2O)4 · Na(H2O)6Orth. 2 2 2 : C2 2 2
9.EE.60IntersiliteNa6Mn2+Ti[Si10O24(OH)](OH)3 · 4H2OMon.
9.EE.65ZakharoviteNa4Mn5Si10O24(OH)6 · 6H2OTrig. 3m
9.EE.65ShafranovskiteNa3K2(Mn,Fe,Na)4[Si9(O,OH)27](OH)2 · nH2OTrig. 3m : P3 1c
9.EE.70ZeophylliteCa13Si10O28(OH)2F8 · 6H2OTrig. 3 : R3
9.EE.75Minehillite(K,Na)2-3Ca28Zn4Al4Si40O112(OH)16Hex.
9.EE.80Fedorite(Na,K)2-3(Ca4Na3)Si16O38(OH,F)2 · 3.5H2OTric. 1 : P1
9.EE.80Martinite(Na,◻,Ca)12Ca4(Si,S,B)14B2O38(OH,Cl)2F2 · 4H2OTric. 1 : P1
9.EE.80EllingseniteNa5Ca6Si18O38(OH)13 · 6H2OTric. 1 : P1
9.EE.85Lalondeite(Na,Ca)6(Ca,Na)3Si16O38(F,OH)2 · 3H2OTric. 1 : P1

Fluorescence of KodamaiteHide

In UV light:
pronounced bluish-white fluorescence under both long- and medium-wave ultraviolet radiation, much less so under short-wave radiation

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 KodamaiteHide

References for KodamaiteHide

Localities for KodamaiteHide

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.
Canada (TL)
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Miyawaki et al. (2019)
      • Lajemmerais RCM
        • Varennes & St-Amable
          • Saint-Amable sill
Modris Baum specimen +1 other reference
Namibia
 
  • Khomas Region
    • Windhoek Rural
      • Aris
Blaß et al. (2021)
USA
 
  • Virginia
    • Augusta County
      • West Augusta
Robin D. Tibbit (deceased)
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