Katayamalite Mineral Data (original) (raw)
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
______ ______
100.00 % 100.14 % = TOTAL OXIDE
Empirical Formula:
KNa0.25Ca7Li3Ti2Si12O36(OH)1.5F0.5
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:
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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 |
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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
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),
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:
PEKatayamalite = 4.84 barns/electron
U=PEKatayamalite x relectron= 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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Print or Cut-and-Paste your Katayamalite Specimen Label here :
Katayamalite
(K,Na)Ca7Li3Ti2[Si6O18]2(OH,F)2
Dana No: 61.01.04.02 Strunz No: 09.CJ.25
Locality:
Notes: