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Webster 1913 Edition

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Noun.

[Cf. F.

idrialine

(Min.)

A bituminous substance obtained from the mercury mines of Idria, where it occurs mixed with cinnabar.

idrialite ‎(plural idrialites)

(mineralogy) A soft, orthorhombic hydrocarbon mineral, usually greenish-yellow to light brown in colour with bluish fluorescence.