Imandrite Mineral Data

General Imandrite Information

Chemical Formula:

Na12Ca3Fe+++2Si12O36

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

Empirical Formula:

Na₁₂Ca₃Fe³⁺₂Si₁₂O₃₆

Environment:

Found in eudialyte in an alkalic pegmatite.

IMA Status:

Approved IMA 1979

Locality:

Khibiny massif, near Lake Imandra, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Imandrite + Pronunciation

Synonym:

ICSD 200805

PDF 39-403

Imandrite Image

Images:

Imandrite

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

Axial Ratios:

a:b:c =0.7041:1:0.9796

Cell Dimensions:

a = 7.426, b = 10.546, c = 10.331, Z = 1; V = 809.07 Den(Calc)= 2.92

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnnm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.63(1), 1.853(0.7), 3.33(0.6),

Crystal Structure:

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Chernitsova N M , Pudovkina Z V , Voronkov A A , Ilyukhin V V , Pyatenko Y A , Doklady Akademii Nauk SSSR , 252 (1980) p.618-621, Imandrite Na12Ca3Fe2[Si6O18]2 - a representative of, a new branch in the lovozerite structural family

Physical Properties of Imandrite

Color:

Honey yellow.

Density:

2.93

Diaphaneity:

Transparent

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Hardness:

5-5.5 - Apatite-Knife Blade

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Imandrite

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

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

Electron Density:

Bulk Density (Electron Density)=2.88 gm/cc
note: Specific Gravity of Imandrite =2.92 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Imandrite= 4.59 barns/electron
U=PE_Imandrite x rElectron Density= 13.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Imandrite is Not Radioactive

Imandrite Classification

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

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

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Imandrite Specimen Label here :

Imandrite

Na12Ca3Fe+++2Si12O36
Dana No: 61.01.02b.01 Strunz No: 09.CJ.20
Locality:

Notes: