Mineralogy Database

Katayamalite Mineral Data

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General Katayamalite Information

Help on Chemical  Formula: Chemical Formula: (K,Na)Ca7Li3Ti2[Si6O18]2(OH,F)2
Help on Composition: Composition: Molecular Weight = 1,389.99 gm
   Potassium   2.81 %  K     3.39 % K2O
   Sodium      0.41 %  Na    0.56 % Na2O
   Lithium     1.50 %  Li    3.22 % Li2O
   Calcium    20.18 %  Ca   28.24 % CaO
   Titanium    6.89 %  Ti   11.49 % TiO2
   Silicon    24.25 %  Si   51.87 % SiO2
   Hydrogen    0.11 %  H     0.97 % H2O
   Oxygen     43.16 %  O
   Fluorine    0.68 %  F     0.68 % F
                -   %   F    -0.29 % -O=F2    
             ______        ______ 
             100.00 %      100.14 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: KNa0.25Ca7Li3Ti2Si12O36(OH)1.5F0.5
Help on Environment: Environment: Found in an aegirine syenite. Isostructural with baratovite and is the hydroxyl endmember of the series.
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: Iwagi Islet, Ehime Prefecture, Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Nobuo Katayama (1910-), prominent Japanese mineralogist.
Help on Name Pronunciation: Name Pronunciation: Katayamalite + Pronunciation Say KATAYAMALITE

Katayamalite Image

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Comments: White katayamalite, in white albite, with brown sugilite. Inset image shows specimen under UV-SW light, albite (dull red), katayamalite (blue-white) and sugilite (non-fluorescent).
Location: Iwagi Island, Inland Sea (Setonaikai), Ehime Prefecture, Japan. Scale: Specimen Size 2.5 cm.
© Jeff Weissman / Photographic Guide to Mineral Species

Katayamalite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5744:1:1.1783
Help on Cell Dimensions: Cell Dimensions: a = 9.721, b = 16.923, c = 19.942, Z = 4; alpha = 91.43°, beta = 104.15°, gamma = 89.94° V = 3,180.10 Den(Calc)= 2.90
Help on Crystal System: Crystal System: Triclinic - Pedial H-M Symbol (1) Space Group: C1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.23(1), 1.933(0.4), 2.42(0.3),2.9(0.3), 2.94(0.3), 3.06(0.3), 1.382(0.2), 1.841(0.2),

Physical Properties of Katayamalite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: White.
Help on Density: Density: 2.91
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Habit: Habit: Twinning Common - Crystals are usually twinned.
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luminescence: Luminescence: Fluorescent, Short UV=bright blue white.
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white

Optical Properties of Katayamalite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.232,KPDmeas= 0.2312,KC= 0.2336
Ncalc = 1.68
Help on Optical Data: Optical Data: Biaxial (+), a=1.67, b=1.671, g=1.677, bire=0.0070, 2V(Calc)=46, 2V(Meas)=32. Dispersion r > v strong.

Calculated Properties of Katayamalite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.87 gm/cc
note: Specific Gravity of Katayamalite =2.90 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEKatayamalite = 4.84 barns/electron
U=PEKatayamalite x relectron= 13.90 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 40.21 (Gamma Ray American Petroleum Institute Units)
Concentration of Katayamalite per GRapi unit = 2.49 (%)

Estimated Radioactivity from Katayamalite - barely detectable


Katayamalite Classification

Help on  Dana Class: Dana Class: (61)Cyclosilicate Six-Membered Rings
  (61.01)with [Si6O18] rings; possible (OH) and Al substitution
  (61.01.04)Baratovite group Baratovite KCa7(Ti,Zr)2Li3Si12O36F2 C 2/c 2/m Katayamalite (K,Na)Ca7Li3Ti2[Si6O18]2(OH,F)2 C1 1 Faizievite! K2Na(Ca6Na)Ti4Li6Si24O66F2 P1 1 IMA2009-004 KCa7Sn2Li3Si12O36F2 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.CJ.25 09 - SILICATES (Germanates)
  09.C - Cyclosilicates
  09.CJ -[Si6O18]12- 6-membered single rings (sechser-Einfachringe),
09.CJ.25 Baratovite KCa7(Ti,Zr)2Li3Si12O36F2 C 2/c 2/m
09.CJ.25 Katayamalite (K,Na)Ca7Li3Ti2[Si6O18]2(OH,F)2 C1 1

Other Katayamalite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Katayamalite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 09.CJ.25





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