Difference between revisions of "Anorthite"

From CAMEO
Jump to: navigation, search
(talk)
(Description)
Line 2: Line 2:
 
== 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).
+
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 ==

Revision as of 13:12, 7 January 2014

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.)

Raman

AnorthiteRS.jpg

FTIR

Anorthite.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

Authority

  • 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

Retrieved from "http://cameo.mfa.org/index.php?title=Anorthite&oldid=42778"