Tosudite Mineral Data

Tosudite Mineral Data +

General Tosudite Information

Chemical Formula:

Na0,5(Al,Mg)6(Si,Al)8O18(OH)12·5(H2O)

Composition:

Molecular Weight = 973.76 gm

Sodium 1.18 % Na 1.59 % Na₂O

Magnesium 4.99 % Mg 8.28 % MgO

Aluminum 13.85 % Al 26.18 % Al₂O₃

Silicon 20.19 % Si 43.19 % SiO₂

Hydrogen 2.28 % H 20.35 % H₂O

Oxygen 57.51 % O

______ ______

100.00 % 99.59 % = TOTAL OXIDE

Empirical Formula:

Na_0.5Al₄Mg₂Si₇AlO₁₈(OH)₁₂·5(H₂O)

Environment:

Hydrothermal alteration product of tuffs, andesites, sediments, and so on.

IMA Status:

Approved IMA 1963

Locality:

Al-tosudite - Alushta, Crimea, Russia. Mg-tosudite - Kamakita mine, Aomori Prefecture, Japan. Li-tosudite - Himalaya pegmatite, San Diego County, Californina, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Toshio Sudo (1911-), Japanese mineralogist and crystallographer, University of Tokyo, Japan.

Synonym:

Alushtite

Chlorite

Tosudite Image

Images:

Tosudite

Comments: Fine grained massive tosudite.
Location: Takatama Mine, Fukushima, Japan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Tosudite Crystallography

Axial Ratios:

a:b:c =0.5617:1:3.3483

Cell Dimensions:

a = 5, b = 8.9, c = 29.8, Z = 2; V = 1,326.10 Den(Calc)= 2.44

Crystal System:

OrthorhombicSpace Group: Unk

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

By Intensity(I/I_o): 4.53(1), 15(0.7), 4.97(0.45),

Physical Properties of Tosudite

Cleavage:

[001] Perfect

Color:

Azure, Blue white, Green, Yellow, White.

Density:

2.42

Habit:

Massive - Lamellar - Distinctly foliated fine-grained forms.

Hardness:

1-2 - Between Talc and Gypsum

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Tosudite

Gladstone-Dale:

CI meas= -0.045 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.037 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2414,KPDmeas= 0.2434,KC= 0.2328

Optical Data:

Biaxial (-), a=1.542-1.564, b=1.57, g=1.548-1.74, bire=0.0060-0.1760

Calculated Properties of Tosudite

Electron Density:

r_electron=2.48 gm/cc
note: r_Tosudite=2.44 gm/cc.

Fermion Index

Fermion Index = 0.01469
Boson Index = 0.98531

Photoelectric:

PE_Tosudite= 1.36 barns/electron
U=PE_Tosudite x r_electron= 3.37 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tosudite is Not Radioactive

Tosudite Classification

Dana Class:

71.4.2.4 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.4)interlayered 1:1, 2:1, and octahedra

(71.4.2)Interstratified Chlorite-Smectite group

71.4.2.1 Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m

71.4.2.2 Lunijianlaite LiAl6(Si7Al)O20(OH)10 Unk Mono

71.4.2.3 Saliotite Na0.5Li0.5Al3AlSi3O10(OH)5 C 2/m 2/m

71.4.2.4 Tosudite Na0,5(Al,Mg)6(Si,Al)8O18(OH)12·5(H2O) Unk Ortho

71.4.2.5 Corrensite (Ca,Na,K)(Mg,Fe,Al)9(Si,Al)8O20(OH)10·n(H2O) Unk Ortho

71.4.2.6 Kulkeite Na0.35Mg8AlSi7O20(OH)10 Unk Mono

71.4.2.7 Rectorite (Na,Ca)Al4(Si,Al)8O20(OH)4·2(H2O) Unk Mono

71.4.2.8 Aliettite [Mg3Si4O10(OH)2](Ca0.5,Na)0.33(Al,Mg,Fe)2-3(Si,Al)4O10(OH)2·n(H2O) Unk Mono

71.4.2.9 Glagolevite! NaMg6[Si3AlO10](OH,O)8·H2O C1 1

Strunz Class:

VIII/H.18-50 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups

VIII/H.18 - Smectite/Montmorillonite group

VIII/H.18-05 Lunijianlaite LiAl6(Si7Al)O20(OH)10 Unk Mono

VIII/H.18-07 Saliotite Na0.5Li0.5Al3AlSi3O10(OH)5 C 2/m 2/m

VIII/H.18-10 Kulkeite Na0.35Mg8AlSi7O20(OH)10 Unk Mono

VIII/H.18-20 Aliettite [Mg3Si4O10(OH)2](Ca0.5,Na)0.33(Al,Mg,Fe)2-3(Si,Al)4O10(OH)2·n(H2O) Unk Mono

VIII/H.18-30 Rectorite (Na,Ca)Al4(Si,Al)8O20(OH)4·2(H2O) Unk Mono

VIII/H.18-50 Tosudite Na0,5(Al,Mg)6(Si,Al)8O18(OH)12·5(H2O) Unk Ortho

VIII/H.18-60 Corrensite (Ca,Na,K)(Mg,Fe,Al)9(Si,Al)8O20(OH)10·n(H2O) Unk Ortho

VIII/H.18-70 Hydrobiotite [K(Mg,Fe)3(Al,Fe)Si3O10(OH,F)2]·[(Mg,Fe,Al)3(Si,Al)4O10(OH)2·4(H2O)] C 2/m 2/m

Other Tosudite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

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Tosudite

Na0,5(Al,Mg)6(Si,Al)8O18(OH)12·5(H2O)
Dana No: 71.4.2.4 Strunz No: VIII/H.18-50
Locality:

Notes: