zircon – מילון אנגלי-אנגלי
zircon
n.
semi-precious stone, mineral
Zircon
Zircon ( or ; 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 (Zr
1–y,
REEy)(SiO
4)
1–x(OH)
4x–y. Zircon forms in silicate melts with large proportions of
high field strength incompatible elements. For example,
hafnium is almost always present in quantities ranging from 1 to 4%. The crystal structure of zircon is
tetragonal crystal system. The natural color of zircon varies between colorless, yellow-golden, red, brown, blue, and green. Colorless specimens that show gem quality are a popular substitute for
diamond and are also known as "Matura diamond".
zircon
Noun
1. a common mineral occurring in small crystals; chief source of zirconium; used as a refractory when opaque and as a gem when transparent
(synonym) zirconium silicate
(hypernym) mineral
(hyponym) hyacinth, jacinth
(substance-meronym) zirconium, Zr, atomic number 40
zircon
nm.
zircon, semi-precious stone, mineral
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.
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter.
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