Difference between pages "Chrysoberyl" and "Civet hair"

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[[File:pc21249chrysoberyl.jpg|thumb|Chrysoberyl]]
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[[File:civetwp2.jpg|thumb|Lesser Indian Civet]]
 
== Description ==
 
== Description ==
  
A hard green to yellow mineral composed of beryllium aluminate. Chrysoberyl occurs in granitic rocks, pegmatites, and mica schists. Some transparent varieties of chrysoberyl have been used as [[gemstone|gemstones]]. In the 18th century, a large deposit of clear, yellowish-green chrysoberyls was found in Brazil and the stones were popularly used for Portuguese and Spanish jewelry. [[Cat's eye]] chrysoberyls are cut as [[cabochon|cabochons]] and polished. The [[alexandrite]] variety of chrysoberyl appears red in artificial light and green in daylight. Chrysoberyls are found in the Ural Mountains (alexandrite), Czech Republic, Sri Lanka, Rhodesia, Brazil, Malagasy Republic and the United States (New York, Colorado).
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Long, coarse hair obtained from civet cats (family Vivarridae) that are native to Africa, southern Europe, and Asia. The black and white civet hair is strong, straighter, and more resilient than [[skunk hair]]. Civet hair was once used for [[paint]] and [[varnish]] [[brush|brushes]] but has since been replaced by [[synthetic fiber|synthetic fibers]]. In 2004, the U.S. banned the importation of civets as potential disease carriers.
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[[File:civetcatlarge.jpg|thumb|Civet hair]]
  
 
== Synonyms and Related Terms ==
 
== Synonyms and Related Terms ==
  
cat's eye; cymophane; golden beryl; alexandrite; oriental chrysolite; crisoberilo (Esp., Port.); chryzoberyl (Pol.); Chrysoberyll (Deut.); chrysoberyl (Ned.)
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Vivarridae; civet cat hair; desmerdyr (Dan.); Schleichkatzen (Deut.); viverridés (Fr.); civetkatachtigen (Ned.); civeta (Port.)
 
 
[[[SliderGallery rightalign|chrysoberylRS.jpg~Raman]]]
 
 
 
==Physical and Chemical Properties==
 
 
 
* Orthorhombic crystal system. 
 
* Good cleavage in one direction.   
 
* Fracture = uneven to conchoidal.
 
* Luster = vitreous. 
 
* Streak = colorless to white.
 
* Alexandrite is strongly pleochroic.
 
 
 
{| class="wikitable"
 
|-
 
! scope="row"| Composition
 
| BeAl2O4
 
|-
 
! scope="row"| Mohs Hardness
 
| 8.5
 
|-
 
! scope="row"| Density
 
| 3.5-3.8 g/ml
 
|-
 
! scope="row"| Refractive Index
 
| 1.745-1.754
 
|}
 
 
 
== Comparisons ==
 
 
 
[[media:download_file_403.pdf|Properties of Gemstones]]
 
  
 
==Resources and Citations==
 
==Resources and Citations==
* Mineralogy Database: [http://www.webmineral.com/data/Chrysoberyl.shtml Chrysoberyl]
 
* Jack Odgen, ''Jewellery of the Ancient World'', Rizzoli International Publications Inc., New York City, 1982
 
 
* R.F.Symmes, T.T.Harding, Paul Taylor, ''Rocks, Fossils and Gems'', DK Publishing, Inc., New York City, 1997
 
 
* ''Encyclopedia Britannica'', http://www.britannica.com  Comment: "chrysoberyl." Accessed 7 Apr. 2005 .
 
 
* 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/Chrysoberyl (Accessed Sept. 2, 2005)
 
 
* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971  Comment: p. 101
 
  
* ''Van Nostrand's Scientific Encyclopedia'', Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
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* ''Encyclopedia Britannica'', http://www.britannica.com  Comment: civet" Encyclopædia Britannica    [Accessed October 16, 2003].
  
* Random House, ''Webster's Encyclopedic Unabridged Dictionary of the English Language'', Grammercy Book, New York, 1997
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* Zora Sweet Pinney, 'A Handle on the Terms used for Artists' Brushes', unpublished glossary, 1999
  
* ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998
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* Wikipedia: http://en.wikipedia.org/wiki/Civet (Accessed Oct. 18, 2005)
  
  
  
 
[[Category:Materials database]]
 
[[Category:Materials database]]

Latest revision as of 11:22, 30 May 2022

Lesser Indian Civet

Description

Long, coarse hair obtained from civet cats (family Vivarridae) that are native to Africa, southern Europe, and Asia. The black and white civet hair is strong, straighter, and more resilient than Skunk hair. Civet hair was once used for Paint and Varnish brushes but has since been replaced by synthetic fibers. In 2004, the U.S. banned the importation of civets as potential disease carriers.

Civet hair

Synonyms and Related Terms

Vivarridae; civet cat hair; desmerdyr (Dan.); Schleichkatzen (Deut.); viverridés (Fr.); civetkatachtigen (Ned.); civeta (Port.)

Resources and Citations

  • Zora Sweet Pinney, 'A Handle on the Terms used for Artists' Brushes', unpublished glossary, 1999