Difference between revisions of "Anorthite"

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== Description ==
 
== Description ==
  
A calcium-rich plagioclase feldspar mineral composed of calcium aluminosilicate. Anorthite occurs as brittle, translucent, white ,or gray crystals. It is found in many igneous rocks such as [http://cameo.mfa.org/materials/fullrecord.asp?name=gabbro gabbro] and [http://cameo.mfa.org/materials/fullrecord.asp?name=granite granite]. Major deposits occur in Italy (Trentino, the lavas of Vesuvius, and Monte Somma), Finland, Sweden (Södermanland), India (Tamil Nadu), Japan (Miyake), and the United States (New Jersey).
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A calcium-rich plagioclase feldspar mineral composed of calcium aluminosilicate. Anorthite occurs as brittle, translucent, white ,or gray crystals. It is found in many igneous rocks such as [[gabbro|gabbro]] and [[granite|granite]]. Major deposits occur in Italy (Trentino, the lavas of Vesuvius, and Monte Somma), Finland, Sweden (Södermanland), India (Tamil Nadu), Japan (Miyake), and the United States (New Jersey).
  
 
== Synonyms and Related Terms ==
 
== Synonyms and Related Terms ==
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calcium feldspar; Anorthit (Deut.); anorthiet (Ned.); anortyt (Pol); anortita (Esp.); anortite (Port.); anortyt (Ned.)
 
calcium feldspar; Anorthit (Deut.); anorthiet (Ned.); anortyt (Pol); anortita (Esp.); anortite (Port.); anortyt (Ned.)
  
[[[SliderGallery rightalign|anorthiteRS.jpg~Raman|Anorthite.jpg~FTIR]]]
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[[[SliderGallery rightalign|Anorthite PMA.TIF~FTIR (MFA)|anorthiteRS.jpg~Raman]]]
  
 
== Other Properties ==
 
== Other Properties ==
  
Crystalline system = triclinic  Cleavage = perfect in one direction  Pleochroism = yellow to dark green to transparent to opaque
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* Crystalline system = triclinic   
 
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* Cleavage = perfect in one direction   
Luster = vitreous
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*Pleochroism = yellow to dark green to transparent to opaque
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* Luster = vitreous
  
 
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== Authority ==
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== Resources and Citations ==
  
* ''Encyclopedia Britannica'', http://www.britannica.com  Comment: "anorthite" Encyclopædia Britannica    [Accessed March 4, 2002].
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* ''Encyclopedia Britannica'', http://www.britannica.com  Comment: "anorthite" [Accessed March 4, 2002].
  
 
* Robert Fournier, ''Illustrated Dictionary of Practical Pottery'', Chilton Book Company, Radnor, PA, 1992
 
* Robert Fournier, ''Illustrated Dictionary of Practical Pottery'', Chilton Book Company, Radnor, PA, 1992
  
* Wikipedia, the free encyclopedia, at http://www.wikipedia.com  Comment: http://en.wikipedia.org/wiki/Anorthite (accessed Jun 2005)
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* Wikipedia: http://en.wikipedia.org/wiki/Anorthite (accessed Jun 2005)
  
 
* ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998
 
* ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998

Latest revision as of 13:41, 22 August 2020

Anorthite

Description

A calcium-rich plagioclase feldspar mineral composed of calcium aluminosilicate. Anorthite occurs as brittle, translucent, white ,or gray crystals. It is found in many igneous rocks such as Gabbro and Granite. Major deposits occur in Italy (Trentino, the lavas of Vesuvius, and Monte Somma), Finland, Sweden (Södermanland), India (Tamil Nadu), Japan (Miyake), and the United States (New Jersey).

Synonyms and Related Terms

calcium feldspar; Anorthit (Deut.); anorthiet (Ned.); anortyt (Pol); anortita (Esp.); anortite (Port.); anortyt (Ned.)

FTIR (MFA)

Anorthite PMA.TIF

Raman

AnorthiteRS.jpg


Other Properties

  • Crystalline system = triclinic
  • Cleavage = perfect in one direction
  • Pleochroism = yellow to dark green to transparent to opaque
  • Luster = vitreous
Composition CaAl2Si2O8
Mohs Hardness 6.0-6.5
Density 2.74-2.76
Refractive Index 1.51

Resources and Citations

  • Robert Fournier, Illustrated Dictionary of Practical Pottery, Chilton Book Company, Radnor, PA, 1992
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
  • CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: density=2.74-2.76

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