General Information:
Chemical Formula:
Na0,5(Al,Mg)6(Si,Al)8O18(OH)12·5(H2O)
Composition:
(Molecular Weight = 952.59 gm)
Sodium 1.21 % Na
Magnesium 5.10 % Mg
Aluminum 28.32 % Al
Silicon 17.69 % Si
Hydrogen 2.33 % H
Oxygen 45.35 % O
Empirical Formula:
Na0.5Mg2Si6Al10O10(OH)12·5(H2O)
Environment:
Hydrothermal alteration product of tuffs, andesites, sediments, and so on.
Locality:
Al-tosudite - Alushta, Crimea, Russia. Mg-tosudite - Kamakita mine, Aomori Prefecture, Japan. Li-tosudite - Himalaya pegmatite, San Diego County, Californina, USA.
Name Origin:
Named for Toshio Sudo (1911-), Japanexe mineralogist and crystallographer, University of Tokyo, Japan.
Physical Properties:
Cleavage:
[001] Perfect
Color:
azure, blue white, green, yellow, or white.
Density:
2.42
Habits:
Massive - Lamellar - Distinctly foliated fine-grained forms., ,
Hardness:
1-2 - Between Talc and Gypsum
Luster:
Vitreous (Glassy)
Streak:
white
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