Sitinakite Mineral Data

Sitinakite Mineral Data +

General Sitinakite Information

Chemical Formula:

Na2K(Ti,Nb)4O4(SiO4)2(O,OH)·4(H2O)

Composition:

Molecular Weight = 658.10 gm

Potassium 5.94 % K 7.16 % K₂O

Sodium 6.99 % Na 9.42 % Na₂O

Titanium 21.83 % Ti 36.41 % TiO₂

Niobium 14.12 % Nb 20.20 % Nb₂O₅

Silicon 8.54 % Si 18.26 % SiO₂

Hydrogen 1.26 % H 11.29 % H₂O

Oxygen 41.33 % O

______ ______

100.00 % 102.74 % = TOTAL OXIDE

Empirical Formula:

Na₂KTi₃NbO_4.75(SiO₄)₂(OH)_0.25·4(H₂O)

IMA Status:

Approved IMA 1992

Locality:

Link to MinDat.org Location Data.

Synonym:

IMA1989-051

Sitinakite Image

Images:

Sitinakite

Comments: Beige translucent crudely formed sitinakite (arrow) crystal with white natrolite and dark, acicular aegirine.
Location: Mount Kukisvumchorr, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Sitinakite Crystallography

Axial Ratios:

a:c = 1:1.54738

Cell Dimensions:

a = 7.819, c = 12.099, Z = 2; V = 739.69 Den(Calc)= 2.95

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4₁/mcm

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

By Intensity(I/I_o): 6.02(1), 7.84(1), 3.25(0.8),

Physical Properties of Sitinakite

Cleavage:

[???] Perfect

Color:

Colorless, Light brown, Pink.

Density:

2.86

Diaphaniety:

Transparent to Translucent

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Sitinakite

Gladstone-Dale:

CI meas= -0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.019 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2997,KPDmeas= 0.3091,KC= 0.3055

Optical Data:

Uniaxial (+), w=1.78, e=1.988, bire=0.2080.

Calculated Properties of Sitinakite

Electron Density:

r_electron=2.78 gm/cc
note: r_Sitinakite=2.86 gm/cc.

Fermion Index

Fermion Index = 0.03241
Boson Index = 0.96759

Photoelectric:

PE_Sitinakite= 25.15 barns/electron
U=PE_Sitinakite x r_electron= 70.02 barns/cc.

Radioactivity:

GRapi = 83.42 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Sitinakite - barely detectable

Sitinakite Classification

Dana Class:

52.4.11.1 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.4)with cations in [6] and/or > [6] coordination

(52.4.11)Dana Group

52.4.11.1 Sitinakite Na2K(Ti,Nb)4O4(SiO4)2(O,OH)·4(H2O) P 4₁/mcm 4/m 2/m 2/m

Strunz Class:

VIII/B.16-30 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12]

VIII/B.16 - Ilmajokite - Tundrite-(Nd) series

VIII/B.16-20 Ilmajokite (Na,Ce,La,Ba)2TiSi3O5(OH)10·n(H2O)(?) C 2/c or Cc Mono

VIII/B.16-30 Sitinakite Na2K(Ti,Nb)4O4(SiO4)2(O,OH)·4(H2O) P 4₁/mcm 4/m 2/m 2/m

VIII/B.16-40 Tundrite-(Ce) Na3(Ce,La)4(Ti,Nb)2(SiO4)2(CO3)3O4(OH)·2(H2O) P1 1

VIII/B.16-50 Tundrite-(Nd) Na3(Nd,La)4(Ti,Nb)2(SiO4)2(CO3)3O4(OH)·2(H2O) P1 1

Other Sitinakite Information

References:

PHYS. PROP.(Am.Min.,Vol.78,p1317,1993) OPTIC PROP.(Am.Min.,Vol.78,p1317,1993)

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Sitinakite

Na2K(Ti,Nb)4O4(SiO4)2(O,OH)·4(H2O)
Dana No: 52.4.11.1 Strunz No: VIII/B.16-30
Locality:

Notes: