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 …...

zircon

[n] - a common mineral occurring in small crystals
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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.encyclo.co.uk/local/20688

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...
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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.encyclo.co.uk/local/20973

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
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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.
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zircon

silicate mineral, zirconium silicate, ZrSiO4, the principal source of zirconium. Zircon is widespread as an accessory mineral in felsic igneous ... [9 related articles]
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Zircon

Zirconium orthosilicate
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Zircon

a zirconium silicate mineral belonging to the group of nesosilicates. Its corresponding chemical formula is ZrSiO4.
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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, ...
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Zircon

Zircon was a codename for a British spy satellite originally intended to be launched 1988. The revelation of the existence of the Zircon project (which had been concealed by the government) by the journalist Duncan Campbell, and the government's subsequent efforts to suppress a programme about it on BBC television, caused much controversy in 1987, ...
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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.
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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 government), and the government's subsequent efforts to suppress a programme about it on BBC television, caused much controversy in 1987. Its intended functi...
Found on http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0007158.html

zircon

Zirconium silicate, ZrSiO4, a mineral that occurs in small quantities in a wide range of igneous, sedimentary, and metamorphic rocks. It is very durable and is resistant to erosion and weathering. It is usually coloured brown, but can be other colours, and when transparent may be used as a gemstone. Zircons contain abundant r...
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Zircon

[satellite] Zircon was the codename for a British signals intelligence satellite, intended to be launched in 1988, before being cancelled. ==History== During the Cold War, Britain`s GCHQ often used America`s National Security Agency (NSA) for communications interception from space. Concern heightened at the time of the 1982 Falklands War. G...
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Zircon

Zircon (ən; including hyacinth or yellow zircon) is a mineral belonging to the group of nesosilicates. Its chemical name is zirconium silicate and its corresponding chemical formula is ZrSiO4. A common empirical formula showing some of the range of substitution in zircon is (Zr1–y, REEy)(SiO4)1–x(OH)4x–y. Zircon forms in silicate melts with...
Found on http://en.wikipedia.org/wiki/Zircon

zircon

A semiprecious gemstone that ranges in colour from brown and violet to blue, red and colourless. Zircon has a hardness of 7.5 on the Mohs Scale
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zircon

Zirconium silicate (ZrSiO4). A primary crystallization product of igneous rocks that can survive geologic processes like erosion, transport and metamorphism. It is important for radiometric dating because it incorporates trace amounts of uranium and thorium.
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