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has gloss | (noun) a colorless (or pale yellow or smoky) variety of zircon jargon, jargoon |
has gloss | eng: Jargoon or jargon (occasionally in old writings jargounce and jacounce) is name applied by gemologists to those zircons which are fine enough to be cut as gemstones, but are not of the red color which characterizes the hyacinth or jacinth. The word is related to Arab zargun (zircon). Some of the finest jargoons are green, others brown and yellow, whilst some are colorless. The colorless jargoon may be obtained by heating certain colored stones. When zircon is heated it sometimes changes in color, or altogether loses it, and at the same time usually increases in density and brilliancy. The so-called Matura diamonds, formerly sent from Matara (or Matura) , in Sri Lanka, were decolorized zircons. The zircon has strong refractive power, and its lustre is almost adamantine, but it lacks the fire of the diamond. |
lexicalization | eng: jargon |
lexicalization | eng: jargoon |
subclass of | (noun) a common mineral occurring in small crystals; chief source of zirconium; used as a refractory when opaque and as a gem when transparent zircon, zirconium silicate |
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lexicalization | fra: zircon |
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similar | e/Jargoon |
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