Dictionary
Thesaurus
Reference
Translate
Web
Related Searches
on Ask.com
ANDRADITE - 2 reference results
Rare Demantoid Garnet
Quality and Value Gems from Africa Multicolour.com Fine Gemstones
multicolour.com
Jewelry Sale Now-Save 75%
Buy Andradite Designer Jewelry, Watches, and More
Sponsored Results www.policeauctions.com
Andradite

Andradite is a species of the Garnet Group. It is a nesosilicate, with formula Ca3Fe2Si3O12.

Andradite includes 3 varieties:

  • Melanite: Black in color, usually not cut as a gemstone.
  • Demantoid: Vivid green in color, one of the most valuable and rare stones in the gemological world.
  • Topazolite: Yellow-green in color and sometimes of high enough quality to be cut into a faceted gemstone.
  • Andradite also is found in rarely colorless.

Andradite was named after the Brazilian mineralogist José Bonifácio de Andrade e Silva (1763-1838). It has a hardness of 6.5 to 7. Associated minerals are micas, diopside, chlorite, and serpentine. It is found in Italy, the Ural Mountains of Russia, Arizona and California.

External links

References

Wikipedia, the free encyclopedia © 2001-2006 Wikipedia contributors (Disclaimer)
This article is licensed under the GNU Free Documentation License.
Last updated on Tuesday October 07, 2008 at 13:19:06 PDT (GMT -0700)
View this article at Wikipedia.org - Edit this article at Wikipedia.org - Donate to the Wikimedia Foundation

Rare Demantoid Garnet
Quality and Value Gems from Africa Multicolour.com Fine Gemstones
multicolour.com
Jewelry Sale Now-Save 75%
Buy Andradite Designer Jewelry, Watches, and More
Sponsored Results www.policeauctions.com
'Rainbow' andradite garnet.(GEMS)(Brief Article)
Jul 01, 2005; One of the more curious and rare garnets, andradite, known for its green gem dispersive variety, demantoid, also occurs in a dark...
Read more with a free trial on HighBeam.com »
Iridescent andradite: garnet meets opal.(GEM PROFILE)
Jul 01, 2006; You've heard of the Mohs scale, that 1-to-10 series of rankings for the hardness of each gem. Ah, but have you heard of the Meg's...
Read more with a free trial on HighBeam.com »
Demantoid andradite garnet.(Jewel of the Month)
Feb 01, 2003; Demantoid, a yellowish-green to green variety of andradite garnet, is so called because of its high dispersion ( fire, or the...
Read more with a free trial on HighBeam.com »
andradite
Jan 01, 1999; andradite Member of the garnet group of minerals , Ca 3 Fe 2 (SiO 4 ) 3 ; sp. gr. 3.75; hardness 6.5–7.5; cubic ; yellow,...
Read more with a free trial on HighBeam.com »
melanite
Jan 27, 2009; mel·a·nite / ˈmeləˌnīt / • n. a velvet-black variety of andradite (garnet). ORIGIN:...
Read more with a free trial on HighBeam.com »
HighBeam Research, Inc. © Copyright 2009.

Search another word or see ANDRADITE on Dictionary | Thesaurus