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Montmorillonite / Bentonite Synonyms:
Montmorillonite, Bentonite, 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, Saponite, CAS 1318-93-0, CAS 1302-78-9, CAS 12199-37-0, CAS 1302-76-7,
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Montmorillonite / Bentonite Designations:
Chemical Name: Hydrated sodium calcium aluminum silicate
Chemical Formula: (Na, Ca)(Al,Mg)6(Si4010)3(OH)6-nH20
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Montmorillonite / Bentonite Description:
1) 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.
2) 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").
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Montmorillonite / Bentonite Nominal Chemical Composition (%):
Al= 9.98, Si= 20.78, H= 4.10 and 0=65.12
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Montmorillonite / Bentonite Physical Properties Available:
Powder
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Montmorillonite / Bentonite Nominal Physical Constants:
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Molecular Weight (g/mol.)
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540.46
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Average Density (g/cm3)
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2.35
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Crystal System
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Monoclinic
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Member Of
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Smectite group
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Fracture
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Uneven to lamellar
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Luster
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Earthy (dull)
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Thermal Conductivity (cal/s-cm-°C)
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Mohs Hardness @20°C
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1.5- 2.0
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Average Specific Gravity (g/cc)
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2.3- 3
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Color
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White, yellow
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Cleavage
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Perfect in one direction, basal
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Characteristic
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Crystals expand to many times their volume when added to water
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Field Indicators
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Softness, and soapy feel
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Montmorillonite / Bentonite Typical Applications:
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; Used as a base for cosmetics and medicines; Montmorillonite clay is widely used in medicine and pharmacology.
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Montmorillonite / Bentonite Packaging:
Jars, pails, drums, multiply paper bags, bulk bags and fiberboard containers. For further information on packaging options contact READE
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Montmorillonite / Bentonite TSCA (SARA Title III) Status:
Yes. For further information please call the E.P.A. at +1.202.554.1404
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Montmorillonite / Bentonite CAS Numbers:
1) Sodium Montmorillonite (Western Bentonite)= 1318-93-0
2) Sodium Montmorillonite (Wyoming Bentonite)= 1302-78-9
3) Magnesium Montmorillonite= 12199-37-0
4) Calcium Montmorillonite (Mississippi bentonite)= 1302-76-7
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