Difference between revisions of "Grossular"

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== Description ==
 
== Description ==
  
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A calcium aluminum [http://cameo.mfa.org/materials/fullrecord.asp?name=garnet garnet] that occurs in shades of pale green, amber, pink, red, brown, or black. Yellow brown to red grossular, called [http://cameo.mfa.org/materials/fullrecord.asp?name=hessonite hessonite], was used for ancient engraved gems and was mined in Ceylon. Green grossular, called gooseberry garnet, is found in Siberia. Grossular garnets are also found in the Urals, Italy, Switzerland, Mexico, and the United States (Maine and New Hampshire).
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A shortened name for grossularite. See [http://cameo.mfa.org/materials/fullrecord.asp?name=garnet garnet].
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== Synonyms and Related Terms ==
 
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grossularite; hessonite; garnet; gooseberry garnet; grossulária (Port.)
 
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== Other Properties ==
 
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Fracture = conchoidal.  Luster = vitreous to resinous.  Streak = colorless.  Birefringence = none. Dispersion = 0.028  Pleochroism = none.
 
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Fluorescence is pale orange in longwave UV and yellow in shortwave UV
 
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{| class="wikitable"
 
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|-
 
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! scope="row"| Composition
 
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| Ca3Al2(SiO4)3
 
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|-
 
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! scope="row"| Mohs Hardness
 
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| 7.0 - 7.5
 
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|-
 
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! scope="row"| Density
 
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| 3.61
 
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|-
 
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! scope="row"| Refractive Index
 
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| 1.734-1.740
 
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|}
 
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== Additional Information ==
 
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Mineralogy Database: [http://www.webmineral.com/data/Grossular.shtml Grossularite]
 
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== Authority ==
 
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* Jack Odgen, ''Jewellery of the Ancient World'', Rizzoli International Publications Inc., New York City, 1982
 
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* ''Van Nostrand's Scientific Encyclopedia'', Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
 
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* ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998
 
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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
 
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[[Category:Materials database]]
 
[[Category:Materials database]]

Revision as of 12:20, 15 December 2013

Description

A shortened name for grossularite. See garnet.

Retrieved from "https://cameo.mfa.org/index.php?title=Grossular&oldid=41146"