(View exact match)crucibleCATEGORY: 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 smeltingCATEGORY: 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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DEFINITION: An important early Indonesian port in west Java that was along the spice trade route in the first centuries AD. The burial site yielded crucibles, bronze items, and Indo-Roman rouletted ware.Fort HarrouardCATEGORY: site
DEFINITION: A Middle Neolithic fort in Eure-et-Loir, France, that was occupied till the Gall-Roman period. There was a Chasséen phase with decorated vase supports and terra-cotta female figurines, an Artenacien occupation, and evidence of metallurgy in the Middle and Late Bronze Age (crucibles, molds, etc.).Mlu PreiCATEGORY: site
DEFINITION: Prehistoric sites in north-central Cambodia, including O Yak, O Pie Can, and O Nari, occupied in the transition between the Neolithic to bronze and then iron. There were polished stone adzes, flaked sidescrapers, and bone projectile points during the Neolithic. Bronze items and clay crucibles followed and then the iron axes and other artifacts.Non Pa WaiCATEGORY: site
DEFINITION: Prehistoric copper-extracting and -smelting sites in Khao Wong Prachan valley, Khorat, Thailand. There are crucibles, tuyères, ore, cup molds for ingot casting, and clay bivalve molds for bracelets; ax, spear, and arrowheads. The site is dated c 1500-250 BC.PfynCATEGORY: culture
DEFINITION: Middle Neolithic culture of northeast Switzerland, with a number of lake dwellings and related to the Michelsberg culture of Rhineland. Pottery was round and flat-based and there are also copper objects and crucibles.cupellationCATEGORY: geology
DEFINITION: A process in metallurgy, the separation of gold or silver from impurities by melting the impure metal in a cupel (crucible) and then directing a blast of hot air on it in a special furnace. The impurities, including lead, copper, tin, and other unwanted metals, are oxidized and partly vaporized and partly absorbed into the pores of the cupel. It is used to obtain silver by separating it from the lead with which it is naturally associated in argentiferous lead ores, or to obtain gold from the naturally occurring alloy of argentiferous gold (electrum).damasceningSYNONYMS OR RELATED TERMS: damaskeening
DEFINITION: The art of incrusting one metal on another, in the form of wire, which by undercutting and hammering is completely attached to the metal it ornaments. The process of etching slight ornaments on polished steel wares is also called damascening. Although related to pattern-welding, this technique used in the manufacture of sword blades probably developed independently. First a high-carbon steel is produced by firing wrought iron and wood together in a sealed crucible; the resulting steel, or wootz, consists of light cementations in a darker matrix, and this, together with a series of complicated forging techniques at relatively low temperatures produced the delicate 'watered silk' pattern with the alternating high- and low-carbon areas. Damascene steel was very strong and highly elastic.grogCATEGORY: artifact
DEFINITION: Fragments of old or wasted pottery or firebricks which are ground up and added to clay as filler material to help reduce plasticity. Grog is used in the manufacture of refractory products (as crucibles) to reduce shrinkage in drying and firing.