|
   
Montmorillonite, Smectite, Nanoclay, Sodium montmorillonite (Sodium bentonite (Wyoming bentonite (US)), Swelling bentonite (Western bentonite (US), Sodium-activated bentonite (Bentonite (UK)), Sodium-exchanged bentonite, (Synthetic bentonite)), Calcium montmorillonite (Calcium bentonite (Mississippi bentonite (US)), Sub-bentonite (Texas bentonite (US)), Magnesium montmorillonite (Saponite & Armargosite), Potassium montmorillonite (Metabentonite), and Lithium montmorillonite (Hectorite), Giliabit, Goumbrine, Gumbrine, Walkerite, Walkthon, Armargosite,
Chemical Name: Hydrated sodium calcium aluminum silicate
Chemical Formula: (Na, Ca)(Al,Mg)6(Si4010)3(OH)6-nH20
a) A clay mineral having a 2:1 expanding crystal lattice. Isomorphous substitution gives the various types and causes a net permanent charge balanced by cations in such a manner that water may move between the sheets, giving reversible cation exchange and very plastic properties.
b) Smectite refers to a family of non-metallic clays primarily composed of hydrated sodium calcium aluminum silicate. Common names for smectite include montmorillonite or sodium montmorillonite ("sodium bentonite" or "Wyoming bentonite") and swelling bentonite ("Western bentonite").
Al= 9.98, Si= 20.78, H= 4.10 and 0=65.12
Pieces, granules, powder
|
Molecular Weight (g/mol.)
|
540.46
|
|
Average Density (g/cm3)
|
2.35
|
|
Crystal System
|
Monoclinic
|
|
Member Of
|
Smectite group
|
|
Fracture
|
Uneven to lamellar
|
|
Luster
|
Earthy (dull)
|
|
Thermal Conductivity (cal/s-cm-°C)
|
|
|
Mohs Hardness @20°C
|
1.5- 2.0
|
|
Average Specific Gravity (g/cc)
|
2.3- 3
|
|
Color
|
White, yellow
|
|
Cleavage
|
Perfect in one direction, basal
|
|
Characteristic
|
Crystals expand to many times their volume when added to water
|
|
Field Indicators
|
Softness, and soapy feel
|
Used to slow the progress of water through soil or rocks; Used in drilling muds to give the water greater viscosity; Used to produce nanocomposites: Used as an absorbent to purify and decolor liquids; Used as a filler in paper and rubber; and used as a base for cosmetics and medicines
Jars, pails, drums, multiply paper bags, bulk bags and fiberboard containers. For further information on packaging options contact READE
Not listed. For further information please call the E.P.A. at 1.202.554.1404
a) Sodium Montmorillonite (Western Bentonite)= 1318-93-0
b) Sodium Montmorillonite (Wyoming Bentonite)= 1302-78-9
c) Magnesium Montmorillonite= 12199-37-0
d) Calcium Montmorillonite (Mississippi bentonite)= 1302-76-7
|
