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From The Collaborative International Dictionary of English v.0.48:
Geocronite \Ge*oc"ro*nite\, n. [Gr. ge`a, gh^, the earth + Kro`nos Saturn, the alchemistic name of lead: cf. G. geokronit.] (Min.) A lead-gray or grayish blue mineral with a metallic luster, consisting of sulphur, antimony, and lead, with a small proportion of arsenic. [1913 Webster]