Katoite Mineral Data

Katoite Mineral Data +

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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

IMA Status:

Approved IMA 1984

Locality:

Link to MinDat.org Location Data.

Synonym:

Hydrogrossular

ICSD 202315

PDF 38-368

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Katoite Crystallography

Cell Dimensions:

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

Crystal System:

Isometric - HexoctahedralH-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),

Crystal Structure:

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Lager G A , Von Dreele R B , American Mineralogist , 81 (1996) p.1097-1104, Neutron powder diffraction study of hydrogarnet to 9.0 GPa, P = 0.0001 GPa

View Additional jPOWD Structure files for Katoite
[1] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [2] [20] [21] [22] [23] [24] [25] [3] [4] [5] [6] [7] [8] [9]

Physical Properties of Katoite

Cleavage:

None

Color:

Colorless, Milky white.

Density:

2.76

Diaphaniety:

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

Optical Data:

Isotropic, n=1.632.

Calculated Properties of Katoite

Electron Density:

r_electron=2.78 gm/cc
note: r_Katoite=2.76 gm/cc.

Fermion Index

Fermion Index = 0.00536
Boson Index = 0.99464

Photoelectric:

PE_Katoite= 4.32 barns/electron
U=PE_Katoite x r_electron= 12.04 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Katoite is Not Radioactive

Katoite Classification

Dana Class:

51.4.3d.2 (51)Nesosilicate Insular SiO4 Groups Only

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

(51.4.3d)Garnet group (Hydrogarnet)

51.4.3d.1 Hibschite Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5) I a3d 4/m 3 2/m

51.4.3d.2 Katoite Ca3Al2(SiO4)3-x(OH)4xx=1.5-3 I a3d 4/m 3 2/m

Strunz Class:

VIII/A.08-90 VIII - Silicates

VIII/A - Nesosilicates with [SiO4]4-groups, cations of octahedral and cubic orientation [8+6]

VIII/A.08 - Garnet group, Pyrope - Henritermierite

VIII/A.08-10 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-20 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-30 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-40 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-50 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-60 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-70 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-80 Hibschite Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5) I a3d 4/m 3 2/m

VIII/A.08-90 Katoite Ca3Al2(SiO4)3-x(OH)4xx=1.5-3 I a3d 4/m 3 2/m

VIII/A.08-100 Hydrougrandite? (Ca,Mg,Fe)3(Fe,Al)2(SiO4)3-x(OH)4x I a3d 4/m 3 2/m

VIII/A.08-110 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-120 Schorlomite Ca3(Ti,Fe,Al)2[(Si,Fe,Fe)O4]3 I a3d 4/m 3 2/m

VIII/A.08-125 Morimotoite Ca3TiFeSi3O12 I a3d 4/m 3 2/m

VIII/A.08-130 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-138 Yamatoite! (Mn,Ca)3(V,Al)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-140 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-150 Kimzeyite Ca3(Zr,Ti)2(Si,Al,Fe)3O12 I a3d 4/m 3 2/m

VIII/A.08-160 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 4₁/acd 4/m 2/m 2/m

Other Katoite Information

References:

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

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Katoite

Ca3Al2(SiO4)3-x(OH)4x x=1.5-3
Dana No: 51.4.3d.2 Strunz No: VIII/A.08-90
Locality:

Notes: