Look up: Zircon

1. 
   Zircon
   Zircon (zirconium silicate) has the formulae ZrSiO4 and a relative hardness of 8. It is a common accessory mineral found in all types of igneous rocks. When transparent it's used as a gemstone.
   Found on http://www.encyclo.co.uk/nol.php
   
   
2. 
   zircon
   [n] - a common mineral occurring in small crystals
   Found on http://www.webdictionary.co.uk/definitio
   
   
3. 
   Zircon
   Codename for a British signals-intelligence satellite originally intended to be launched in 1988. The revelation of the existence of the Zircon project (which had been concealed by the...
   Found on http://www.thehistorychannel.co.uk/site/
   
   
4. 
   zircon
   zircon orthosilicate; this term is also applied by extension to a rock containing a major proportion of this mineral Category: Various industries and crafts
   Found on http://www.mijnwoordenboek.nl/definition
   
   
5. 
   Zircon
   Gemstone which ranges in colour through yellow, red and orange to green. Colourless, golden-brown and sky-blue versions are produced by heat treatment. Most of the mineral suitable for gemstones comes from the Far East and Sri Lanka. Yellow and brown shades of zircon were often termed hyacinth, and transparent or colourless types are sometimes know ...
   Found on http://www.antique-crafts.co.uk/glossary
   
   
6. 
   Zircon
   Zir'con noun [ French, the same word as jargon . See Jargon a variety of zircon.] (Min.) A mineral occurring in tetragonal crystals, usually of a brown or gray color. It consists of silica and zirconia. A red variety, used as a gem, is called hyacinth . Colorless, pale-yellow or smoky- brown varieties from Ceylon are called jargon . Zircon syenite , a ...
   Found on http://www.encyclo.co.uk/webster/Z/4
   
   
7. 
   zircon
   <chemical> A mineral occurring in tetragonal crystals, usually of a brown or gray colour. It consists of silica and zirconia. A red variety, used as a gem, is called hyacinth. Colourless, pale-yellow or smoky-brown varieties from Ceylon are called jargon. Zircon syenite, a coarse-grained syenite containing zircon crystals and often also elaeo ...
   Found on http://www.mondofacto.com/facts/dictiona
   
   
8. 
   zircon
   zirconium silicate noun a common mineral occurring in small crystals; chief source of zirconium; used as a refractory when opaque and as a gem when transparent
   Found on http://wordnet.princeton.edu/perl/webwn?
   
   
9. 
   Zircon
   `Zircon` is a mineral belonging to the group of nesosilicates. Its chemical name is zirconium silicate and its corresponding chemical formula is ZrSiO4. Hafnium is almost always present in quantities ranging from 1 to 4%. The crystal structure of zircon is tetragonal crystal class. The natural color of zircon varies between colorless, yellow-golden, red, brown, and green. Colorless specimens that show gem quality are a popular substitute for diam...
   Found on http://en.wikipedia.org/wiki/Zircon
   
   
10. 
    Zircon
    • (n.) A mineral occurring in tetragonal crystals, usually of a brown or gray color. It consists of silica and zirconia. A red variety, used as a gem, is called hyacinth. Colorless, pale-yellow or smoky-brown varieties from Ceylon are called jargon.
    Found on http://thinkexist.com/dictionary/meaning
    
    
11. 
    zircon
    silicate mineral, zirconium silicate, ZrSiO4, the principal source of zirconium. Zircon is widespread as an accessory mineral in felsic igneous ... [9 related articles]
    Found on http://www.britannica.com/eb/a-z/z/9
    
    
12. 
    zircon
    Zircon crystals. Credit: NSF A hard silicate mineral (ZrSiO₄), a major ore of zirconium of widepsread occurrence. Zircon forms prismatic crystals in the tetragonal system, which when transparent are used as gems. They may be colorless, red, orange, yellow, green, or blue, ...
    Found on http://www.daviddarling.info/encyclopedi