Difference between revisions of "Kaolinite"
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== Description == | == 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. | + | 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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* ThermoFisher: [https://www.fishersci.com/store/msds?partNumber=AC211740010&productDescription=KAOLIN+1KG&vendorId=VN00032119&countryCode=US&language=en SDS] | * ThermoFisher: [https://www.fishersci.com/store/msds?partNumber=AC211740010&productDescription=KAOLIN+1KG&vendorId=VN00032119&countryCode=US&language=en SDS] | ||
== Physical and Chemical Properties == | == Physical and Chemical Properties == | ||
| − | + | * Composition = Al2Si2O5(OH4) | |
| + | * Mohs Hardness = 2.0 - 2.5 | ||
| + | * Density = 2.6-2.63 g/ml | ||
| + | * Refractive Index = 1.558; 1.565; 1.564 | ||
* Insoluble in water, cold acids and alkalis. | * Insoluble in water, cold acids and alkalis. | ||
* Monoclinic system with with hexagonal, plate-like crystals 0.1-1.0 micrometers. | * Monoclinic system with with hexagonal, plate-like crystals 0.1-1.0 micrometers. | ||
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* Fracture = earthy (friable). | * Fracture = earthy (friable). | ||
* Luster =dull to pearly. | * Luster =dull to pearly. | ||
| − | * Streak = white | + | * Streak = white |
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== Resources and Citations == | == Resources and Citations == | ||
| − | + | * WebMinerals: [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. | * R. Fournier, ''Illustrated Dictionary of Practical Pottery'', Chilton Book Co., Radnor, PA, 1996. | ||
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* Mineralogy Database: [http://www.webmineral.com/data/Kaolinite.shtml Kaolinite] | * Mineralogy Database: [http://www.webmineral.com/data/Kaolinite.shtml Kaolinite] | ||
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* ''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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* Art and Architecture Thesaurus Online, http://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000 | * Art and Architecture Thesaurus Online, http://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000 | ||
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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 | ||
| − | + | * Wikipedia: [https://en.wikipedia.org/wiki/Kaolinite Kaolinite] (Accessed Sept. 7, 2005 and March 2025) | |
| − | * Wikipedia: | ||
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* 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 | ||
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[[Category:Materials database]] | [[Category:Materials database]] | ||
Revision as of 12:23, 12 March 2025
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.);
Risks
- Noncombustible.
- ThermoFisher: SDS
Physical and Chemical Properties
- Composition = Al2Si2O5(OH4)
- Mohs Hardness = 2.0 - 2.5
- Density = 2.6-2.63 g/ml
- Refractive Index = 1.558; 1.565; 1.564
- 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
Resources and Citations
- WebMinerals: Kaolinite
- R. Fournier, Illustrated Dictionary of Practical Pottery, Chilton Book Co., Radnor, PA, 1996.
- Mineralogy Database: Kaolinite
- Encyclopedia Britannica, http://www.britannica.com Comment: "kaolinite" [Accessed December 4, 2001].
- Art and Architecture Thesaurus Online, http://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000
- C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
- Wikipedia: Kaolinite (Accessed Sept. 7, 2005 and March 2025)
- R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966