Feklichevite Mineral Data

Feklichevite Mineral Data

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General Feklichevite Information

Chemical Formula:

Na11Ca9(Fe+++,Fe++)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5

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

Empirical Formula:

Na_11.13Ca_8.35Mn²⁺_0.21Sr_0.08Ce_0.03La_0.02Fe³⁺_1.21Fe²⁺_0.87Zr_2.85Hf_0.09Ti_0.05Nb_0.55Si_25.24 O₇₃(OH)_2.41(H₂O)_1.87O_0.21Cl_0.52F_0.19

Environment:

Found in a pegmatoidal cancrinite syenite vein. Eudialyte group; structure

IMA Status:

Approved IMA 2001 (Dana # Added)

Locality:

Kovdor phlogopite mine, Kovdor massif, Kola Peninsula, Russia Link to MinDat.org Location Data.

Name Origin:

Named for V. G. Feklichev (1933-1999), Russian mineralogist.

Synonym:

IMA2000-017

Feklichevite Image

Images:

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

Axial Ratios:

a:c = 1:2.11645

Cell Dimensions:

a = 14.255, c = 30.17, Z = 3; V = 5,309.34 Den(Calc)= 2.85

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m

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

By Intensity(I/I_o): 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

Cleavage:

[001] Perfect

Color:

Dark brown, Brownish black, Brown, Pinkish brown.

Density:

2.87

Diaphaniety:

Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Equant Grains - Granular material with equel dimensions in x, y, and z.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

5.5 - Knife Blade

Luster:

Vitreous (Glassy)

Streak:

brown

Optical Properties of Feklichevite

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

Optical Data:

Uniaxial (-), e=1.616, w=1.62, bire=0.0040.

Calculated Properties of Feklichevite

Electron Density:

r_electron=2.81 gm/cc
note: r_Feklichevite=2.87 gm/cc.

Fermion Index

Fermion Index = 0.02361
Boson Index = 0.97639

Photoelectric:

PE_Feklichevite= 23.94 barns/electron
U=PE_Feklichevite x r_electron= 67.32 barns/cc.

Radioactivity:

GRapi = 240.12 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Feklichevite - barely detectable

Feklichevite Classification

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

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

References:

NAME( AmMin, 87:1732) PHYS. PROP.(AmMin, 87:1732) OPTIC PROP.(AmMin, 87:1732)

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: