Mineralogy Database

Sitinakite Mineral Data

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General Sitinakite Information

Help on Chemical  Formula: Chemical Formula: Na2K(Ti,Nb)4O4(SiO4)2(O,OH)•4(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Na2KTi3NbO4.75(SiO4)2(OH)0.25•4(H2O)
Help on Environment: Environment: In hydrothermally altered portions of alkalic pegmatites in a differentiated alkalic massif.
Help on IMA Status: IMA Status: Approved IMA 1992
Help on Locality: Locality: Mts. Kukisvumchorr and Yukspor, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named forr SIlicon; TItanium; sodium, NAtrium; and potassium, Kalium, in its composition.
Help on Name Pronunciation: Name Pronunciation: Sitinakite + Pronunciation Say SITINAKITE
Help on Synonym: Synonym: IMA1989-051

Sitinakite Image

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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

Help on Axial Ratios: Axial Ratios: a:c = 1:1.54738
Help on Cell Dimensions: Cell Dimensions: a = 7.819, c = 12.099, Z = 2; V = 739.69 Den(Calc)= 2.95
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 41/mcm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.02(1), 7.84(1), 3.25(0.8),

Physical Properties of Sitinakite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Colorless, Light brown, Pink.
Help on Density: Density: 2.86
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Sitinakite

Help on Gladstone-Dale: 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
Ncalc = 1.87 - 1.9
Help on Optical Data: Optical Data: Uniaxial (+), w=1.78, e=1.988, bire=0.2080.

Calculated Properties of Sitinakite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.78 gm/cc
note: Specific Gravity of Sitinakite =2.86 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PESitinakite = 25.15 barns/electron
U=PESitinakite x relectron= 70.02 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 83.42 (Gamma Ray American Petroleum Institute Units)
Concentration of Sitinakite per GRapi unit = 1.20 (%)

Estimated Radioactivity from Sitinakite - barely detectable


Sitinakite Classification

Help on  Dana Class: Dana Class: (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.04)with cations in [6] and/or > [6] coordination
  (52.04.11)Dana Group Sitinakite Na2K(Ti,Nb)4O4(SiO4)2(O,OH)•4(H2O) P 41/mcm 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.AG.30 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AG -Nesosilicates with additional anions; cations in > [6] � [6] coordination
09.AG.30 Sitinakite Na2K(Ti,Nb)4O4(SiO4)2(O,OH)•4(H2O) P 41/mcm 4/m 2/m 2/m

Other Sitinakite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.78,p1317,1993) OPTIC PROP.(Am.Min.,Vol.78,p1317,1993)
Help on See Also: See Also: Links to other databases for Sitinakite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 09.AG.30





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