Katoite Mineral Data

General Katoite Information

Chemical Formula:

Ca3Al2(SiO4)3-x(OH)4x x=1.5-3

Composition:

Molecular Weight = 414.37 gm

Calcium 29.02 % Ca 40.60 % CaO

Aluminum 13.02 % Al 24.61 % Al₂O₃

Silicon 10.17 % Si 21.75 % SiO₂

Hydrogen 1.46 % H 13.04 % H₂O

Oxygen 46.33 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₃Al₂(SiO₄)_1.5(OH)₆

Environment:

A hydrothermal mineral in cavities in a phonolitic lava flow that erupted through an argillaceous marl.

IMA Status:

Approved IMA 1984

Locality:

Campomorto quarry, near Montalto di Castro, Lazio, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for Akira Kato, mineralogist of the National Science Museum, Tokyo, Japan.

Name Pronunciation:

Katoite

Synonym:

Hydrogrossular

ICSD 202315

PDF 38-368

Katoite Image

Images:

Katoite

Comments: Pale yellow to colorless euhedral katoite crystals associated with dark brown andradite crystals.
Location: Wilui River, Russia. Scale: See Image.
© Rruff Database

Katoite Crystallography

Cell Dimensions:

a = 12.358, Z = 8; V = 1,887.32 Den(Calc)= 2.92

Crystal System:

Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: I a3d

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

By Intensity(I/I_o): 2.763(1), 2.004(0.58), 2.257(0.58),

Physical Properties of Katoite

Cleavage:

None

Color:

Colorless, Milky white.

Density:

2.76

Diaphaneity:

Transparent to Translucent

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Katoite

Gladstone-Dale:

CI meas= -0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.041 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2164,KPDmeas= 0.229,KC= 0.2258
Ncalc = 1.62 - 1.66

Optical Data:

Isotropic, n=1.632.

Calculated Properties of Katoite

Electron Density:

Bulk Density (Electron Density)=2.78 gm/cc
note: Specific Gravity of Katoite =2.76 gm/cc.

Fermion Index:

Fermion Index = 0.0053642676
Boson Index = 0.9946357324

Photoelectric:

PE_Katoite= 4.32 barns/electron
U=PE_Katoite x rElectron Density= 12.04 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Katoite is Not Radioactive

Katoite Classification

Dana Class:

51.04.03d.02 (51)Nesosilicate Insular SiO4 Groups Only

(51.04)with cations in [6] and >[6] coordination

(51.04.03d)Garnet group (Hydrogarnet)

51.04.03d.01 Hibschite Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5) I a3d 4/m 3 2/m

51.04.03d.02 Katoite Ca3Al2(SiO4)3-x(OH)4xx=1.5-3 I a3d 4/m 3 2/m

Strunz Class:

09.AD.25 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AD -Nesosilicates without additional anions;

09.AD.25 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Hibschite Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5) I a3d 4/m 3 2/m

09.AD.25 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 4₁/acd 4/m 2/m 2/m

09.AD.25 Katoite Ca3Al2(SiO4)3-x(OH)4xx=1.5-3 I a3d 4/m 3 2/m

09.AD.25 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Kimzeyite Ca3(Zr,Ti)2(Si,Al,Fe)3O12 I a3d 4/m 3 2/m

09.AD.25 Morimotoite Ca3TiFeSi3O12 I a3d 4/m 3 2/m

09.AD.25 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Schorlomite Ca3(Ti,Fe,Al)2[(Si,Fe,Fe)O4]3 I a3d 4/m 3 2/m

09.AD.25 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Wadalite Ca6Al5Si2O16Cl3 I 43d 4 3m

09.AD.25 Holtstamite! Ca3(Al,Mn)2(SiO4)2(OH)4 I 4₁/acd 4/m 2/m 2/m

Other Katoite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Katoite :
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
15 - WWW-MINCRYST

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Katoite

Ca3Al2(SiO4)3-x(OH)4x x=1.5-3
Dana No: 51.04.03d.02 Strunz No: 09.AD.25
Locality:

Notes:

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