Difference between revisions of "Kaolinite"

From CAMEO
Jump to navigation Jump to search
(username removed)
Line 2: Line 2:
 
== Description ==
 
== Description ==
  
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.
+
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 ==

Revision as of 10:29, 21 January 2014

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.);

Other 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
Refractive Index 1.558; 1.565; 1.564

Hazards and Safety

Noncombustible.

Mallinckrodt Baker: MSDS

Additional Information

° R. Fournier, Illustrated Dictionary of Practical Pottery, Chilton Book Co., Radnor, PA, 1996. ° Mineralogy Database: Kaolinite

Authority

  • 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=45111"