Difference between revisions of "Anorthite"
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== Other Properties == | == Other Properties == | ||
| − | Crystalline system = triclinic Cleavage = perfect in one direction Pleochroism = yellow to dark green to transparent to opaque | + | * Crystalline system = triclinic |
| − | + | * Cleavage = perfect in one direction | |
| − | + | *Pleochroism = yellow to dark green to transparent to opaque | |
| + | * Luster = vitreous | ||
{| class="wikitable" | {| class="wikitable" | ||
| Line 31: | Line 32: | ||
|} | |} | ||
| − | == | + | == Resources and Citations == |
| − | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "anorthite" | + | * ''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 | + | * 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 | ||
Revision as of 12:41, 22 August 2020
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.)
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
- 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
- Wikipedia: http://en.wikipedia.org/wiki/Anorthite (accessed Jun 2005)
- 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