Katayamalite Mineral Data

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General Katayamalite Information

Chemical Formula:

(K,Na)Ca7Li3Ti2[Si6O18]2(OH,F)2

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

Empirical Formula:

KNa_0.25Ca₇Li₃Ti₂Si₁₂O₃₆(OH)_1.5F_0.5

Environment:

Found in an aegirine syenite. Isostructural with baratovite and is the hydroxyl endmember of the series.

IMA Status:

Approved IMA 1983

Locality:

Iwagi Islet, Ehime Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

Named for Nobuo Katayama (1910-), prominent Japanese mineralogist.

Name Pronunciation:

Katayamalite + Pronunciation

Katayamalite Image

Images:

Katayamalite

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

Axial Ratios:

a:b:c =0.5744:1:1.1783

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

Crystal System:

Triclinic - PedialH-M Symbol (1) Space Group: C1

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

By Intensity(I/I_o): 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),

Crystal Structure:

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Kato T , Murakami N , Mineralogical Journal , 12 (1985) p.206-217, The crystal structure of katayamalite, Locality: Iwagi Islet, Ehime Prefecture, Japan

Physical Properties of Katayamalite

Cleavage:

{001} Perfect

Color:

White.

Density:

2.91

Habit:

Tabular - Form dimensions are thin in one direction.

Habit:

Twinning Common - Crystals are usually twinned.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luminescence:

Fluorescent, Short UV=bright blue white.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Katayamalite

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

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

Electron Density:

Bulk Density (Electron Density)=2.87 gm/cc
note: Specific Gravity of Katayamalite =2.90 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Katayamalite= 4.84 barns/electron
U=PE_Katayamalite x r_electron= 13.90 barns/cc.

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

Dana Class:

61.01.04.02 (61)Cyclosilicate Six-Membered Rings

(61.01)with [Si6O18] rings; possible (OH) and Al substitution

(61.01.04)Baratovite group

61.01.04.01 Baratovite KCa7(Ti,Zr)2Li3Si12O36F2 C 2/c 2/m

61.01.04.02 Katayamalite (K,Na)Ca7Li3Ti2[Si6O18]2(OH,F)2 C1 1

61.01.04.03 Faizievite! K2Na(Ca6Na)Ti4Li6Si24O66F2 P1 1

61.01.04.04 IMA2009-004 KCa7Sn2Li3Si12O36F2 C 2/m 2/m

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

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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
11 - WWW-MINCRYST

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Katayamalite

(K,Na)Ca7Li3Ti2[Si6O18]2(OH,F)2
Dana No: 61.01.04.02 Strunz No: 09.CJ.25
Locality:

Notes: