מינרלי חרסית - קבוצה של מינרלים השייכים לקבוצת המינרלים הפילוסיליקטים (סיליקטים במבנה בצורת לוחיות).

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(ש) חרסית - סוג של מינרל (כימיה)

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nf. smectite

(n.)
A hydrous silicate of alumina, of a greenish color, which, in certain states of humidity, appears transparent and almost gelatinous.
  

General Information:
 Chemical Formula:
(Na,Ca)Al4(Si,Al)8O20(OH)4·2(H2O)
 IMA Status:
Approved IMA 1963
 Locality:
Blue Mountain district, Marble, Garland County, Arkansas, USA.
 Name Origin:
Named for E. W. Rector (1849-), legislator and lawyer of Hot Springs, Arkansas, USA.
Physical Properties:
 Cleavage:
[???] Perfect
 Color:
yellowish white or white.
 Habits:
Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite)., ,
 Hardness:
1-2 - Between Talc and Gypsum
 Luster:
Earthy (Dull)
 Streak:
white
More details...

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
More details...

smectite /'smektait/

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