Raslakite Mineral Data

Raslakite Mineral Data

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General Raslakite Information

Chemical Formula:

Na15Ca3Fe3(Na,Zr)3Zr3(Si,Nb)(Si25O73)(OH,H2O)3(Cl,OH)

Composition:

Molecular Weight = 2,774.01 gm

Sodium 15.03 % Na 20.25 % Na₂O

Calcium 4.48 % Ca 6.27 % CaO

Zirconium 2.47 % Zr 3.33 % ZrO₂

Niobium 0.84 % Nb 1.20 % Nb₂O₅

Iron 6.04 % Fe 7.77 % FeO

Silicon 26.07 % Si 55.77 % SiO₂

Hydrogen 0.15 % H 1.30 % H₂O

Chlorine 0.96 % Cl 0.96 % Cl

- % Cl -0.22 % -O=Cl₂

Oxygen 43.98 % O

______ ______

100.00 % 96.63 % = TOTAL OXIDE

Empirical Formula:

Na_15.88Ca_3.1Fe²⁺₃Na_2.25Zr_0.75Si_0.75Nb_0.25Si₂₅O₇₃(OH)_2.25(H₂O)_0.75Cl_0.75(OH)_0.25

Environment:

Found in perialkaline pegmatites. Eudialyte group; structure determined

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Mount Karnasurt, Lovozwro alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named after the Raslak cirques near Mount Kedykverpakhk.

Synonym:

IMA2002-067

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Raslakite Crystallography

Axial Ratios:

a:c = 1:2.1097

Cell Dimensions:

a = 14.229, c = 30.019, Z = 3; V = 5,263.51 Den(Calc)= 2.63

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): 2.853(1)(404), 2.974(0.86)(315), 4.311(0.66)(205),3.209(0.58)(208), 3.023(0.4)(119), 4.095(0.37)(116), 5.72(0.35)(202), 2.592(0.34)(039), 11.48(0.33),

Physical Properties of Raslakite

Cleavage:

None

Color:

Brownish red.

Density:

2.95

Diaphaniety:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Raslakite

Gladstone-Dale:

CI meas= -0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.159 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2317,KPDmeas= 0.2066,KC= 0.1999

Optical Data:

Uniaxial (+), w=1.608, e=1.611, bire=0.0030.

Calculated Properties of Raslakite

Electron Density:

r_electron=2.91 gm/cc
note: r_Raslakite=2.95 gm/cc.

Fermion Index

Fermion Index = 0.01649
Boson Index = 0.98351

Photoelectric:

PE_Raslakite= 8.08 barns/electron
U=PE_Raslakite x r_electron= 23.48 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Raslakite is Not Radioactive

Raslakite Classification

Dana Class:

64.1.1.16 (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.25-16 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 Raslakite Information

References:

NAME( CanMin, v 42, p 932) PHYS. PROP.(CanMin, v 42, p 932) OPTIC PROP.(CanMin, v 42, p 932)

See Also:

Links to other databases for Raslakite :
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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Raslakite

Na15Ca3Fe3(Na,Zr)3Zr3(Si,Nb)(Si25O73)(OH,H2O)3(Cl,OH)
Dana No: 64.1.1.16 Strunz No: VIII/E.25-16
Locality:

Notes: