Mineralogy Database

Imandrite Mineral Data

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General Imandrite Information

Help on Chemical  Formula: Chemical Formula: Na12Ca3Fe+++2Si12O36
Help on Composition: Composition: Molecular Weight = 1,420.81 gm
   Sodium   19.42 %  Na   26.17 % Na2O
   Calcium   8.46 %  Ca   11.84 % CaO
   Iron      7.86 %  Fe   11.24 % Fe2O3
   Silicon  23.72 %  Si   50.75 % SiO2
   Oxygen   40.54 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na12Ca3Fe3+2Si12O36
Help on Environment: Environment: Found in eudialyte in an alkalic pegmatite.
Help on IMA Status: IMA Status: Approved IMA 1979
Help on Locality: Locality: Khibiny massif, near Lake Imandra, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Imandrite + Pronunciation Say IMANDRITE
Help on Synonym: Synonym: ICSD 200805
  PDF 39-403

Imandrite Image

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Comments: Honey-yellow colored rims of imandrite surrounding grains of pink eudialyte.
Location: Vuonnemiok River Valley, Khibiny Massif, Kola Peninsula, Russia. Scale: Picture Size 5 mm.
© Jeff Weissman / Photographic Guide to Mineral Species

Imandrite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7041:1:0.9796
Help on Cell Dimensions: Cell Dimensions: a = 7.426, b = 10.546, c = 10.331, Z = 1; V = 809.07 Den(Calc)= 2.92
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnnm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.63(1), 1.853(0.7), 3.33(0.6),

Physical Properties of Imandrite

Help on Color: Color: Honey yellow.
Help on Density: Density: 2.93
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Hardness: Hardness: 5-5.5 - Apatite-Knife Blade
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Imandrite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.037 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.033 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2083,KPDmeas= 0.2076,KC= 0.2156
Ncalc = 1.63
Help on Optical Data: Optical Data: Biaxial (+), a=1.605, b=1.608, g=1.612, bire=0.0070, 2V(Calc)=82, 2V(Meas)=75.

Calculated Properties of Imandrite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.88 gm/cc
note: Specific Gravity of Imandrite =2.92 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEImandrite = 4.59 barns/electron
U=PEImandrite x rElectron Density= 13.21 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Imandrite is Not Radioactive

Imandrite Classification

Help on  Dana Class: Dana Class: 61.01.02b.01 (61)Cyclosilicate Six-Membered Rings
  (61.01)with [Si6O18] rings; possible (OH) and Al substitution
  (61.01.02b)Lovozerite group (Ortho and MON subgroup)
61.01.02b.01 Imandrite Na12Ca3Fe2Si12O36 Pnnm 2/m 2/m 2/m
61.01.02b.02 Koashvite Na6(Ca,Mn)(Ti,Fe)Si6O18•(H2O) Pmnb 2/m 2/m 2/m
61.01.02b.03 Petarasite Na5Zr2Si6O18(Cl,OH)•2(H2O) P 21/m 2/m
61.01.02b.04 Litvinskite! Na2([],Na,Mn)Zr[Si6O12(OH,O)6] Cm m
Help on  Strunz Class: Strunz Class: 09.CJ.20 09 - SILICATES (Germanates)
  09.C - Cyclosilicates
  09.CJ -[Si6O18]12- 6-membered single rings (sechser-Einfachringe),
09.CJ.20 Koashvite Na6(Ca,Mn)(Ti,Fe)Si6O18•(H2O) Pmnb 2/m 2/m 2/m
09.CJ.20 Imandrite Na12Ca3Fe2Si12O36 Pnnm 2/m 2/m 2/m

Other Imandrite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Imandrite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: 61.01.02b.01 Strunz No: 09.CJ.20





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