Feklichevite Mineral Data

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General Feklichevite Information

Help on Chemical  Formula: Chemical Formula: Na11Ca9(Fe+++,Fe++)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5
Help on Composition: Composition: Molecular Weight = 3,038.68 gm
   Sodium      8.42 %  Na   11.35 % Na2O
   Strontium   0.23 %  Sr    0.27 % SrO
   Calcium    11.01 %  Ca   15.41 % CaO
   Lanthanum   0.09 %  La    0.11 % La2O3
   Cerium      0.14 %  Ce    0.16 % Ce2O3
   Hafnium     0.53 %  Hf    0.62 % HfO2
   Zirconium   8.56 %  Zr   11.56 % ZrO2
   Titanium    0.08 %  Ti    0.13 % TiO2
   Manganese   0.38 %  Mn    0.49 % MnO
   Niobium     1.68 %  Nb    2.41 % Nb2O5
   Iron        3.82 %  Fe    2.06 % FeO /  3.18 % Fe2O3
   Silicon    23.33 %  Si   49.91 % SiO2
   Hydrogen    0.20 %  H     1.82 % H2O
   Chlorine    0.61 %  Cl    0.61 % Cl
                -   %  Cl   -0.14 % -O=Cl2
   Oxygen     40.80 %  O
   Fluorine    0.12 %  F     0.12 % F
                -   %  F    -0.05 % -O=F2
             ______        ______ 
             100.00 %      100.02 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na11.13Ca8.35Mn2+0.21Sr0.08Ce0.03La0.02Fe3+1.21Fe2+0.87Zr2.85Hf0.09Ti0.05Nb0.55Si25.24 O73(OH)2.41(H2O)1.87O0.21Cl0.52F0.19
Help on Environment: Environment: Found in a pegmatoidal cancrinite syenite vein. Eudialyte group; structure
Help on IMA Status: IMA Status: Approved IMA 2001 (Dana # Added)
Help on Locality: Locality: Kovdor phlogopite mine, Kovdor massif, Kola Peninsula, Russia Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for V. G. Feklichev (1933-1999), Russian mineralogist.
Help on Synonym: Synonym: IMA2000-017
 

Feklichevite Image

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Feklichevite

Comments: Brownish to purplish-brownish crystal of feklichevite.
Location: Kovdor Mine, Kovdor massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 6 mm.
© Thomas Witzke / Abraxas-Verlag

Feklichevite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.11645
Help on Cell Dimensions: Cell Dimensions: a = 14.255, c = 30.17, Z = 3; V = 5,309.34 Den(Calc)= 2.85
Help on Crystal System: Crystal System: Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.854(1)(404), 2.977(0.81)(135), 4.31(0.69)(205),3.218(0.56)(208), 2.602(0.44)(039), 3.036(0.42)(119,042), 6.43(0.39),
 

Physical Properties of Feklichevite

Help on Cleavage: Cleavage: [001] Perfect
Help on Color: Color: Dark brown, Brownish black, Brown, Pinkish brown.
Help on Density: Density: 2.87
Help on Diaphaniety: Diaphaniety: Translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Equant Grains - Granular material with equel dimensions in x, y, and z.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: brown
 

Optical Properties of Feklichevite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.027 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2168,KPDmeas= 0.2153,KC= 0.2097
Help on Optical Data: Optical Data: Uniaxial (-), e=1.616, w=1.62, bire=0.0040.
 

Calculated Properties of Feklichevite

Help on Electron Density: Electron Density:

relectron=2.81 gm/cc
note: rFeklichevite =2.87 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.02361
Boson Index = 0.97639
Help on Photoelectric: Photoelectric:

PEFeklichevite = 23.94 barns/electron
U=PEFeklichevite x relectron= 67.32 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 240.12 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Feklichevite - barely detectable

 

Feklichevite Classification

Help on  Dana Class: Dana Class: 64.1.1.9 (64)Cyclosilicate Rings with Other Anions and Insular Silicate Groups
  (64.1)with mixed ring types
  (64.1.1)Eudialyte Group
 
64.1.1.1 Eudialyte Na4(Ca,Ce)2(Fe,Mn,Y)ZrSi8O22(OH,Cl)2(?) R 3m 3 2/m
 
64.1.1.2 Alluaivite Na19(Ca,Mn)6(Ti,Nb)3(Si3O9)2(Si10O28)2Cl·2(H2O) R 3m 3 2/m
 
64.1.1.3 Kentbrooksite! (Na,REE)15(Ca,REE)6MnZr3NbSi25O74F2·2(H2O) R 3m 3m
 
64.1.1.4 Khomyakovite! Na12Sr3Ca6Fe3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m
 
64.1.1.5 Manganokhomyakovite! Na12Sr3Ca6Mn3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m
 
64.1.1.6 Oneillite! Na15Ca3Mn3Fe3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3 3
 
64.1.1.7 Ferrokentbrooksite! Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3(Cl,F,OH)2 R 3m 3m
 
64.1.1.8 Ikranite! (Na,H3O)15(Ca,Mn,REE)6Fe2Zr3([],Zr)([],Si)Si24O66(O,OH)6Cl·2-3H2O R 3m 3m
 
64.1.1.9 Feklichevite ! Na11Ca9(Fe,Fe)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5 R 3m 3m
 
64.1.1.10 Rastsvetaevite! Na27K8Ca12Fe3Zr6Si52O144(O,OH,H2O)6Cl2 R 3m 3m
 
64.1.1.11 Taseqite! Na12Sr3Ca6Fe3Zr3NbSi25O73(O,OH,H2O)3Cl2 R 3m 3m
 
64.1.1.12 Carbokentbrooksite! (Na,[])12(Na,Ce)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)·H2O R 3m 3m
 
64.1.1.13 Zirsilite-(Ce)! (Na,[])12(Ce,Na)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)·H2O R 3m 3m
 
64.1.1.14 Labyrinthite! (Na,K,Sr)35Ca12Fe3Zr6TiSi51O144(O,OH,H2O)9Cl3 R 3m 3m
 
64.1.1.15 Aqualite! (H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9Cl R 3m 3m
 
64.1.1.16 Raslakite! Na15Ca3Fe3(Na,Zr)3Zr3(Si,Nb)(Si25O73)(OH,H2O)3(Cl,OH) R 3m 3m
 
64.1.1.17 Georgbarsanovite! Na12(Mn,Sr,REE)3Ca6Fe3Zr3NbSi25O76Cl2·H2O R 3m 3m
 
64.1.1.18 IMA2004-026! Na12(Ce,REE,Sr)3Ca6Mn3Zr3W(Si25O73)(OH)3(CO3)·H2O R 3m 3m
 
64.1.1.19 Mogovidite! Na9(Ca,Na)6Ca6Fe2Zr3[]Si25O72(CO3)(OH)4 R 3m 3m
Help on  Strunz Class: Strunz Class: VIII/E.25-50 VIII - Silicates
  VIII/E - Cyklosilicates, triplet rings, nine-rings and ten-rings
  VIII/E.25 - Eudialyte - Alluaivite series
 
VIII/E.25-10 Eudialyte Na4(Ca,Ce)2(Fe,Mn,Y)ZrSi8O22(OH,Cl)2(?) R 3m 3 2/m
 
VIII/E.25-14 Ikranite! (Na,H3O)15(Ca,Mn,REE)6Fe2Zr3([],Zr)([],Si)Si24O66(O,OH)6Cl·2-3H2O R 3m 3m
 
VIII/E.25-16 Raslakite! Na15Ca3Fe3(Na,Zr)3Zr3(Si,Nb)(Si25O73)(OH,H2O)3(Cl,OH) R 3m 3m
 
VIII/E.25-20 Ferrokentbrooksite! Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3(Cl,F,OH)2 R 3m 3m
 
VIII/E.25-30 Kentbrooksite! (Na,REE)15(Ca,REE)6MnZr3NbSi25O74F2·2(H2O) R 3m 3m
 
VIII/E.25-32 Carbokentbrooksite! (Na,[])12(Na,Ce)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)·H2O R 3m 3m
 
VIII/E.25-40 Oneillite! Na15Ca3Mn3Fe3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3 3
 
VIII/E.25-50 Feklichevite Na11Ca9(Fe,Fe)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5 R 3m 3m
 
VIII/E.25-56 Zirsilite-(Ce)! (Na,[])12(Ce,Na)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)·H2O R 3m 3m
 
VIII/E.25-58 Taseqite! Na12Sr3Ca6Fe3Zr3NbSi25O73(O,OH,H2O)3Cl2 R 3m 3m
 
VIII/E.25-60 Khomyakovite! Na12Sr3Ca6Fe3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m
 
VIII/E.25-70 Manganokhomyakovite! Na12Sr3Ca6Mn3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m
 
VIII/E.25-80 Alluaivite Na19(Ca,Mn)6(Ti,Nb)3(Si3O9)2(Si10O28)2Cl·2(H2O) R 3m 3 2/m
 

Other Feklichevite Information

Help on References: References: NAME( AmMin, 87:1732) PHYS. PROP.(AmMin, 87:1732) OPTIC PROP.(AmMin, 87:1732)
Help on See Also: See Also: Links to other databases for Feklichevite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Feklichevite

Na11Ca9(Fe+++,Fe++)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5
Dana No: 64.1.1.9 Strunz No: VIII/E.25-50
Locality:

 

Notes:

 

 
   
 
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