Difference between revisions of "Kaolinite"

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== Description ==
 
== Description ==
  
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A hydrated aluminum silicate mineral which is the principal constituent of [http://cameo.mfa.org/materials/fullrecord.asp?name=kaolin kaolin] clay. Kaolinite crystals have a lamellar or plate-like structure that gives the clay its slippery feel. It is a natural alteration product of aluminum silicate rocks, such as feldspar. Pure kaolinite is a primary clay. Most secondary clays contain only a small percentage of kaolinite (Fournier 1996). One exception is ball clay found in Wareham, England.
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A hydrated aluminum silicate mineral which is the principal constituent of [[kaolin]] clay. Kaolinite crystals have a lamellar or plate-like structure that gives the clay its slippery feel. It is a natural alteration product of aluminum silicate rocks, such as feldspar. Pure kaolinite is a primary clay. Most secondary clays contain only a small percentage of kaolinite (Fournier 1996). One exception is ball clay found in Wareham, England.
  
 
== Synonyms and Related Terms ==
 
== Synonyms and Related Terms ==
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china clay, kaolin; gaoling (Chin.); Kaolinit (Deut.); caolinita (Esp.); kaolinite (Fr.); kaolien (Ned.); kaoliniet (Ned.); caulinite (Port.);
 
china clay, kaolin; gaoling (Chin.); Kaolinit (Deut.); caolinita (Esp.); kaolinite (Fr.); kaolien (Ned.); kaoliniet (Ned.); caulinite (Port.);
  
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== Other Properties ==
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[[[SliderGallery rightalign|Kaolinite PMA.TIF~FTIR (MFA)]]]
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== Risks ==
  
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Insoluble in water, cold acids and alkalis.   
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* Noncombustible.   
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* ThermoFisher: [https://www.fishersci.com/store/msds?partNumber=AC211740010&productDescription=KAOLIN+1KG&vendorId=VN00032119&countryCode=US&language=en SDS]
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== Physical and Chemical Properties ==
  
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Monoclinic system with with hexagonal, plate-like crystals 0.1-1.0 micrometers.   
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* Insoluble in water, cold acids and alkalis. 
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* Monoclinic system with with hexagonal, plate-like crystals 0.1-1.0 micrometers.   
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Perfect cleavage in one direction.  Plastic when wet.  Brittle when dry.   
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* Perfect cleavage in one direction.   
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* Plastic when wet.  Brittle when dry.   
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Fracture = earthy (friable).  Luster =dull to pearly.  Streak = white.
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* Fracture = earthy (friable).   
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* Luster =dull to pearly.   
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* Streak = white.
  
 
{| class="wikitable"
 
{| class="wikitable"
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|-
 
|-
 
! scope="row"| Density
 
! scope="row"| Density
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| 2.6-2.63
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| 2.6-2.63 g/ml
 
|-
 
|-
 
! scope="row"| Refractive Index
 
! scope="row"| Refractive Index
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|}
 
|}
  
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== Hazards and Safety ==
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== Resources and Citations ==
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* * WebMinerals: [http://www.webmineral.com/data/Kaolinite.shtml Kaolinite]
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Noncombustible. 
 
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Mallinckrodt Baker: [http://www.jtbaker.com/msds/englishhtml/k0870.htm MSDS]
 
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== Additional Information ==
 
  
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° R. Fournier, ''Illustrated Dictionary of Practical Pottery'', Chilton Book Co., Radnor, PA, 1996. ° Mineralogy Database: [http://www.webmineral.com/data/Kaolinite.shtml Kaolinite]
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* R. Fournier, ''Illustrated Dictionary of Practical Pottery'', Chilton Book Co., Radnor, PA, 1996.  
  
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== Authority ==
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* Mineralogy Database: [http://www.webmineral.com/data/Kaolinite.shtml Kaolinite]
  
 
* ''Encyclopedia Britannica'', http://www.britannica.com  Comment: "kaolinite"  [Accessed December 4, 2001].
 
* ''Encyclopedia Britannica'', http://www.britannica.com  Comment: "kaolinite"  [Accessed December 4, 2001].
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* C.W.Chesterman, K.E.Lowe, ''Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf, New York, 1979
 
* C.W.Chesterman, K.E.Lowe, ''Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf, New York, 1979
  
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* Wikipedia, the free encyclopedia, at http://www.wikipedia.com  Comment: http://en.wikipedia.org/wiki/Kaolinite (Accessed Sept. 7, 2005)
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* Wikipedia: http://en.wikipedia.org/wiki/Kaolinite (Accessed Sept. 7, 2005)
  
 
* R. J. Gettens, G.L. Stout, ''Painting Materials, A Short Encyclopaedia'', Dover Publications, New York, 1966
 
* R. J. Gettens, G.L. Stout, ''Painting Materials, A Short Encyclopaedia'', Dover Publications, New York, 1966

Latest revision as of 12:38, 15 September 2022

Kaolinite

Description

A hydrated aluminum silicate mineral which is the principal constituent of Kaolin clay. Kaolinite crystals have a lamellar or plate-like structure that gives the clay its slippery feel. It is a natural alteration product of aluminum silicate rocks, such as feldspar. Pure kaolinite is a primary clay. Most secondary clays contain only a small percentage of kaolinite (Fournier 1996). One exception is ball clay found in Wareham, England.

Synonyms and Related Terms

china clay, kaolin; gaoling (Chin.); Kaolinit (Deut.); caolinita (Esp.); kaolinite (Fr.); kaolien (Ned.); kaoliniet (Ned.); caulinite (Port.);

FTIR (MFA)

Kaolinite PMA.TIF

Risks

  • Noncombustible.
  • ThermoFisher: SDS

Physical and Chemical Properties

  • Insoluble in water, cold acids and alkalis.
  • Monoclinic system with with hexagonal, plate-like crystals 0.1-1.0 micrometers.
  • Perfect cleavage in one direction.
  • Plastic when wet. Brittle when dry.
  • Fracture = earthy (friable).
  • Luster =dull to pearly.
  • Streak = white.
Composition Al2Si2O5(OH4)
Mohs Hardness 2.0 - 2.5
Density 2.6-2.63 g/ml
Refractive Index 1.558; 1.565; 1.564

Resources and Citations

  • R. Fournier, Illustrated Dictionary of Practical Pottery, Chilton Book Co., Radnor, PA, 1996.
  • C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
  • R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966

Retrieved from "https://cameo.mfa.org/index.php?title=Kaolinite&oldid=92680"