Imandrite Mineral Data

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.

Synonym:

ICSD 200805

PDF 39-403

Search for Imandrite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

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

Diaphaniety:

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

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:

r_electron=2.88 gm/cc
note: r_Imandrite=2.92 gm/cc.

Fermion Index

Fermion Index = 0.01305
Boson Index = 0.98695

Photoelectric:

PE_Imandrite= 4.59 barns/electron
U=PE_Imandrite x r_electron= 13.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Imandrite is Not Radioactive

Imandrite Classification

Dana Class:

61.1.2b.1 (61)Cyclosilicate Six-Membered Rings

(61.1)with [Si6O18] rings; possible (OH) and Al substitution

(61.1.2b)Lovozerite group (Ortho and MON subgroup)

61.1.2b.1 Imandrite Na12Ca3Fe2Si12O36 Pnnm 2/m 2/m 2/m

61.1.2b.2 Koashvite Na6(Ca,Mn)(Ti,Fe)Si6O18·(H2O) Pmnb 2/m 2/m 2/m

61.1.2b.3 Petarasite Na5Zr2Si6O18(Cl,OH)·2(H2O) P 2₁/m 2/m

61.1.2b.4 Litvinskite! Na2([],Na,Mn)Zr[Si6O12(OH,O)6] Cm m

Strunz Class:

VIII/E.16-10 VIII - Silicates

VIII/E - Cyklosilicates, six rings [Si6O18]12-

VIII/E.16 - Lovozerite group

VIII/E.16-10 Imandrite Na12Ca3Fe2Si12O36 Pnnm 2/m 2/m 2/m

VIII/E.16-20 Kazakovite Na6MnTiSi6O18 R 3m 3 2/m

VIII/E.16-23 Kapustinite! Na5.5Mn0.25ZrSi6O16(OH)2 C 2/m 2/m

VIII/E.16-25 Litvinskite! Na2([],Na,Mn)Zr[Si6O12(OH,O)6] Cm m

VIII/E.16-30 Lovozerite H4Na2Ca(Zr,Ti)[Si6O18] R 3m 3 2/m

VIII/E.16-40 Zirsinalite Na6(Ca,Mn,Fe)Zr[Si6O18] R 3m 3 2/m

VIII/E.16-50 Koashvite Na6(Ca,Mn)(Ti,Fe)Si6O18·(H2O) Pmnb 2/m 2/m 2/m

VIII/E.16-60 Tisinalite Na3H3(Mn,Ca,Fe)TiSi6(O,OH)18·2(H2O) R 3m 3 2/m

VIII/E.16-70 Petarasite Na5Zr2Si6O18(Cl,OH)·2(H2O) P 2₁/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)

Search for Imandrite using:

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

Visit our Advertisers for Imandrite :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
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: 61.1.2b.1 Strunz No: VIII/E.16-10
Locality:

Notes: