Imandrite Mineral Data

[What's New] [Mineral Galleries] [About Us] [Contacts] [Login]
At AA Mineral Specimens, we source quality Mineral Specimens, Fossils, Gemstones,
Decorative Stones, Lapidary Material and Specimen Sets world-wide

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

Search for Imandrite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Imandrite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Imandrite Mineral Data :

Ask about Imandrite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: