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Imandrite

A valid IMA mineral species
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About ImandriteHide

05496490016352576106988.jpg
Lake Imandra, Russia
Formula:
Na12Ca3Fe3+2(Si6O18)2
Colour:
Honey-yellow
Lustre:
Vitreous
Hardness:
5 - 5½
Specific Gravity:
2.93
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.

Unique IdentifiersHide

Mindat ID:
2017
Long-form identifier:
mindat:1:1:2017:2
GUID
(UUID V4):
00716c02-a4d4-42f8-a622-a265a6c25857

IMA Classification of ImandriteHide

Classification of ImandriteHide

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

Mineral SymbolsHide

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

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

Physical Properties of ImandriteHide

Vitreous
Transparency:
Translucent
Colour:
Honey-yellow
Hardness:
5 - 5½ on Mohs scale
Density:
2.93 g/cm3 (Measured)    2.92 g/cm3 (Calculated)

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

Chemistry of ImandriteHide

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

Crystallography of ImandriteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 7.426(4) Å, b = 10.546(1) Å, c = 10.331(1) Å
Ratio:
a:b:c = 0.704 : 1 : 0.98
Unit Cell V:
809.07 ų (Calculated from Unit Cell)
Z:
1
Comment:
Space Group: Pmnn

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0012468ImandriteChernitsova 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 252 618-62119800293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.73 Å(50)
3.33 Å(60)
2.63 Å(100)
1.853 Å(70)
1.520 Å(50)

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 ImandriteHide

General Appearance of Type Material:
Anhedral grains, 1-3 mm
Place of Conservation of Type Material:
Geology Museum, Kola Branch, Academy of Sciences, Apatity,5530; Mining Institute, St. Petersburg, 1298/1; A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 80181; The Natural History Museum, London, England, 1994,10.
Geological Setting of Type Material:
Pegmatitic alkalic rocks
Associated Minerals at Type Locality:
Reference:
Khomyakov, 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.

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:
1 photo of Imandrite associated with EudialyteNa15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2

Related Minerals - Strunz-mindat GroupingHide

9.CJ.AvdeeviteNaAl4(Be5Li)(Si6O18)2(H2O)1-2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
9.CJ.NakkaalaaqiteK2[Na3Ca]LiCa2Ti2Be4Si12O38Orth. mmm (2/m 2/m 2/m) : Fddd
9.CJ.ZolotareviteNa5Zr[Si6O15(OH)3] · 3H2OTrig. 3m (3 2/m) : R3m
9.CJ.Beryllocordierite-NaNaMg4(Al5Be)(AlSi5O18)2 · 2H2OOrth. mmm (2/m 2/m 2/m) : Cccm
9.CJ.Beryllosachanbińskiite-NaNaMn4(Al5Be)(AlSi5O18)2 · 2H2OOrth. mmm (2/m 2/m 2/m) : Cccm
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.05 vaVorobyeviteBe3Al2(Si6O18)
9.CJ.05StoppaniiteBe3Fe3+2(Si6O18) · H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.05Ferroindialite(Fe2+,Mg)2Al4Si5O18Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.05JohnkoivulaiteCs[Be2B]Mg2Si6O18Hex. 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. mmm (2/m 2/m 2/m) : Cccm
9.CJ.15aCombeiteNa4.5Ca3.5Si6O17.5(OH)0.5Trig. 3m (3 2/m) : R3m
9.CJ.15aKazakoviteNa6Mn2+Ti(Si6O18)Trig. 3m (3 2/m) : R3m
9.CJ.15cKoashviteNa6(Ca,Mn)(Ti,Fe)Si6O18 · H2OOrth. mmm (2/m 2/m 2/m)
9.CJ.15aLovozeriteNa2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2OTrig. 3 : R3
9.CJ.15aTisinaliteNa3H3(Mn,Ca,Fe)TiSi6(O,OH)18 · 2H2OTrig. 3m (3 2/m)
9.CJ.15aZirsinaliteNa6(Ca,Mn2+,Fe2+)Zr(Si6O18)Trig. 3m (3 2/m) : R3m
9.CJ.15aLitvinskiteNa2(◻,Na,Mn)ZrSi6O12(OH,O)6Mon. m : Bm
9.CJ.15aKapustiniteNa6ZrSi6O16(OH)2Mon. 2/m : B2/m
9.CJ.15aTownenditeNa8ZrSi6O18Trig. 3m (3 2/m) : R3m
9.CJ.25BaratoviteKCa7(Ti,Zr)2Li3Si12O36F2Mon. 2/m : B2/b
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. 2/m : P21/b
9.CJ.40PetarasiteNa5Zr2(Si6O18)(Cl,OH) · 2H2OMon. 2/m : P21/m
9.CJ.45Gerenite-(Y)(Ca,Na)2(Y,REE)3Si6O18 · 2H2OTric. 1 : P1
9.CJ.50OdintsoviteK2Na4Ca3Ti2Be4Si12O38Orth. mmm (2/m 2/m 2/m) : Fddd
9.CJ.55MathewrogersitePb7FeAl3GeSi12O36(OH,H2O)6Trig.
9.CJ.60PezzottaiteCs(Be2Li)Al2(Si6O18)Trig. 3 : R3

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 ImandriteHide

References 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 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.
China
 
  • Shaanxi
    • Baoji
      • Taibai County
Russia
 
  • Murmansk Oblast
    • Khibiny Massif
 
Mineral and/or Locality  
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