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crucible
CATEGORY: ceramics
DEFINITION: A small, coarse pottery (or other refractory material) vessel used for holding molten metal during smelting, testing, or casting. It is usually easily recognizable from the effects of the high temperatures to which it has been subjected, as well as from its shape and thickness. Crucibles were probably so named from the Latin word crux, "cross" or "trial.
crucible smelting
CATEGORY: geology
DEFINITION: A technique of separating copper from ore by heating the ore in an open vessel, designed to withstand very high temperatures, rather than in a closed furnace.

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