brown fused alumina
11Sapphire — For other uses, see Sapphire (disambiguation). Sapphire The 423 carat (85 g) blue Logan sapphire General Category Oxide mineral …
12Diamond simulant — Due to its low cost and close visual likeness to diamond, cubic zirconia has remained the most gemologically and economically important diamond simulant since 1976. The high price of gem grade diamonds, as well as significant ethical concerns of… …
13silica mineral — Any of the forms of silicon dioxide (SiO2), including quartz, tridymite, cristobalite, coesite, stishovite, melanophlogite, lechatelierite, and chalcedony. Various kinds of silica minerals have been produced synthetically. * * * Introduction… …
14chemical industry — Introduction complex of processes, operations, and organizations engaged in the manufacture of chemicals and their derivatives. Although the chemical industry may be described simply as the industry that uses chemistry and… …
15Niobium — zirconium ← niobium → molybdenum V ↑ Nb ↓ Ta …
16Gas tungsten arc welding — TIG welding of a bronze sculpture Gas tungsten arc welding (GTAW), also known as tungsten inert gas (TIG …
17tungsten processing — Introduction preparation of the ore for use in various products. Tungsten exhibits a body centred cubic (bcc) crystal lattice. It has the highest melting point of all metals, 3,410° C (6,170° F), and it has high conductivity for… …
18Guyana — Not to be confused with Ghana., or French Guiana. For other uses, see Guyana (disambiguation). Co operative Republic of Guyana[1] …
19Iceland — Icelander /uys lan deuhr, leuhn deuhr/, n. /uys leuhnd/, n. 1. a large island in the N Atlantic between Greenland and Scandinavia. 39,698 sq. mi. (102,820 sq. km). 2. a republic including this island and several smaller islands: formerly Danish;… …
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