Definition of "jargoon" []

• A variety of zircon. (noun)

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• "The decolorized zircon (jargoon) has a dispersion well up toward that of diamond and gives fairly vivid spectra on a card, but they are double, as zircon is doubly refracting."
• "The names _hyacinth_, _jacinth_, and _jargoon_ are applied to red, yellow, and colorless zircon in the order as given."
• "Of all colorless stones, the only one likely to mislead the expert in this respect is the whitened zircon (jargoon), which has almost adamantine luster and in addition nearly as high dispersive power as diamond."