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Imandrite

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Formula:
Na12Ca3Fe3+2(Si6O18)2
Hardness:
5 - 5½
Crystal System:
Orthorhombic
Name:
Named by A.P. Khomyakov, N.M. Chernitsova, S.M. Sandomirskaya, and G.L. Vasil’eva for Lake Imanda, Kola Peninsula, Russia, near the type locality. It is the largest lake on the peninsula at 812 km2.
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Classification of ImandriteHide

Approved
9.CJ.15b

9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions
61.1.2b.1

61 : CYCLOSILICATES Six-Membered Rings
1 : Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
14.25.8

14 : Silicates not Containing Aluminum
25 : Silicates of Fe, Ca and alkalis and of Fe, Mg, Ca and alkalis

Physical Properties of ImandriteHide

Hardness:
5 - 5½ on Mohs scale

Optical Data of ImandriteHide

Type:
Biaxial (+)
RI values:
nα = 1.605 nβ = 1.608 nγ = 1.612
2V:
Measured: 75° , Calculated: 82°
Max Birefringence:
δ = 0.007
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v

Chemical Properties of ImandriteHide

Formula:
Na12Ca3Fe3+2(Si6O18)2
IMA Formula:
Na12Ca3Fe3+2Si12O36
Common Impurities:
Ti,Zr,Mn,Mg

Crystallography of ImandriteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 7.42 Å, b = 10.54 Å, c = 10.33 Å
Ratio:
a:b:c = 0.704 : 1 : 0.98
Unit Cell V:
807.88 ų (Calculated from Unit Cell)

Type Occurrence of ImandriteHide

Synonyms of ImandriteHide

Other Language Names for ImandriteHide

German:Imandrit
Spanish:Imandrita

Relationship of Imandrite to other SpeciesHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Eudialyte1 photo of Imandrite associated with Eudialyte on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.CJ.05BazziteBe3Sc2(Si6O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.05BerylBe3Al2(Si6O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.05IndialiteMg2Al3(AlSi5O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.05StoppaniiteBe3Fe3+2(Si6O18) · H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.10Cordierite(Mg,Fe)2Al3(AlSi5O18)Orth. mmm (2/m 2/m 2/m) : Cccm
9.CJ.10Sekaninaite(Fe,Mg)2Al3(AlSi5O18)Orth.
9.CJ.15aCombeiteNa2Ca2(Si6O18)0.5Trig. 3m (3 2/m) : R3m
9.CJ.15aKazakoviteNa6Mn2+Ti(Si6O18)Trig.
9.CJ.15cKoashviteNa6(Ca,Mn)(Ti,Fe)Si6O18 · H2OOrth.
9.CJ.15aLovozeriteNa2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2OMon.
9.CJ.15aTisinaliteNa3H3(Mn,Ca,Fe)TiSi6(O,OH)18 · 2H2OTrig.
9.CJ.15aZirsinaliteNa6(Ca,Mn2+,Fe2+)Zr(Si6O18)Trig.
9.CJ.15aLitvinskiteNa2(◻,Na,Mn)ZrSi6O12(OH,O)6Mon. m : Bm
9.CJ.15aKapustiniteNa5(Na,Mn2+)<1Zr(H2Si6O18)Mon. 2/m
9.CJ.25BaratoviteKCa7(Ti,Zr)2Li3Si12O36F2Mon.
9.CJ.25KatayamaliteKLi3Ca7Ti2(SiO3)12(OH)2Mon. 2/m : B2/b
9.CJ.25AleksandroviteKCa7Sn2Li3Si12O36F2Mon. 2/m : B2/b
9.CJ.30DioptaseCuSiO3 · H2OTrig. 3 : R3
9.CJ.35KostyleviteK2Zr(Si3O9) · H2OMon.
9.CJ.40PetarasiteNa5Zr2(Si6O18)(Cl,OH) · 2H2OMon. 2/m : P21/m
9.CJ.45Gerenite-(Y)(Ca,Na)2(Y,REE)3Si6O18 · 2H2OTric.
9.CJ.50OdintsoviteK2Na4Ca3Ti2Be4Si12O38Orth.
9.CJ.55MathewrogersitePb7FeAl3GeSi12O36(OH,H2O)6Trig.
9.CJ.60PezzottaiteCs(Be2Li)Al2(Si6O18)Trig. 3 : R3

Related Minerals - Dana Grouping (8th Ed.)Hide

61.1.2b.2KoashviteNa6(Ca,Mn)(Ti,Fe)Si6O18 · H2OOrth.
61.1.2b.3PetarasiteNa5Zr2(Si6O18)(Cl,OH) · 2H2OMon. 2/m : P21/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.25.1Winchite☐{CaNa}{Mg4Al}(Si8O22)(OH)2Mon.
14.25.2Ferri-winchite (of Leake 1978)
14.25.3Alumino-ferrowinchite ☐{CaNa}{Fe2+4Al}(Si8O22)(OH)2
14.25.4Ferro-ferri-winchite☐[CaNa][Fe2+4(Fe3+,Al)]Si8O22(OH)2
14.25.5Ferro-winchite ☐{CaNa}{Fe2+4Al}(Si8O22)(OH)2Mon.
14.25.6Arfvedsonite[Na][Na2][Fe2+4Fe3+]Si8O22(OH)2Mon. 2/m : B2/m
14.25.7Ferro-richterite{Na}{CaNa}{Fe2+5}(Si8O22)(OH)2Mon.
14.25.9Yakhontovite(Ca,Na)0.5(Cu,Fe,Mg)2(Si4O10)(OH)2 · 3H2OMon.

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.

References for ImandriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
AKhomyakov, A.P., Chernitsova, N.M., Sandomirskaya, S.M., Vasil’eva, G.L. (1979) Imandrite - a new mineral of lovozerite family. Mineralogiceskij Zhurnal: 1: 89-93. (in Russian)
Fleischer, M., Cabri, L.J., Chao, G.Y., Pabst, A. (1980) New mineral names. American Mineralogist: 65: 808-814.
Chernitsova, N.M., Pudovkina, Z.V., Voronkov, A.A., Ilyukhin, V.V., Pyatenko, Y.A. (1980) Imandrite Na12Ca3Fe2[Si6O18]2 - a representative of a new branch in the lovozerite structural family. Doklady Akademii Nauk SSSR: 252: 618-621. (in Russian)
Pekov, I.V., Krivovichev, S.V., Zolotarev, A.A., Yakovenchuk, V.N., Armbruster, T., Pakhomovsky, Y.A. (2009) Crystal chemistry and nomenclature of the lovozerite group. European Journal of Mineralogy: 21: 1061-1071.

Internet Links for ImandriteHide

Localities for ImandriteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia
 
  • Northern Region
    • Murmanskaya Oblast'
      • Khibiny Massif
Tony Nikischer
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Mineral and/or Locality  
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