Difference between revisions of "Kaolinite"
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[[[SliderGallery rightalign|Kaolinite PMA.TIF~FTIR (MFA)]]] | [[[SliderGallery rightalign|Kaolinite PMA.TIF~FTIR (MFA)]]] | ||
| − | == | + | == Risks == |
| − | Noncombustible. | + | * Noncombustible. |
| − | + | * 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 == | ||
| − | 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. | + | * Perfect cleavage in one direction. |
| − | + | * Plastic when wet. Brittle when dry. | |
| − | Perfect cleavage in one direction. Plastic when wet. Brittle when dry. | + | * Fracture = earthy (friable). |
| − | + | * Luster =dull to pearly. | |
| − | Fracture = earthy (friable). Luster =dull to pearly. Streak = white. | + | * Streak = white. |
{| class="wikitable" | {| class="wikitable" | ||
| Line 33: | Line 32: | ||
|- | |- | ||
! scope="row"| Density | ! scope="row"| Density | ||
| − | | 2.6-2.63 | + | | 2.6-2.63 g/ml |
|- | |- | ||
! scope="row"| Refractive Index | ! scope="row"| Refractive Index | ||
Latest revision as of 12:38, 15 September 2022
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
- 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
- * 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: 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