dull lustre

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• Lustre (mineralogy) — Lustre (or luster) is a description of the way light interacts with the surface of a crystal, rock, or mineral. The word lustre traces its origins back to the Latin word lux, meaning light , and generally implies radiance, gloss, or brilliance. A …   Wikipedia

• Dull —    DULL, a parish, in the county of Perth, 4 miles (W. by N.) from Aberfeldy; containing, with parts of the late quoad sacra parishes of Foss and Tenandry, and part of the village of Aberfeldy, 3811 inhabitants, of whom 145 are in the village of… …   A Topographical dictionary of Scotland

• lustre — /lus teuhr/, n., v.t., v.i., lustred, lustring. Chiefly Brit. luster. * * * In mineralogy, the appearance of a mineral surface in terms of its light reflecting qualities. Lustre depends on a mineral s refractivity (see refraction), transparency,… …   Universalium

• Lustre — Luster Lus ter, Lustre Lus tre, n. [F. lustre; cf. It. lustro; both fr. L. lustrare to purify, go about (like the priests at the lustral sacrifice), traverse, survey, illuminate, fr. lustrum a purificatory sacrifice; perh. akin to E. loose. But… …   The Collaborative International Dictionary of English

• staurolite — staurolitic /stawr euh lit ik/, adj. /stawr euh luyt /, n. a mineral, basic iron aluminum silicate, Fe2Al2O7(SiO4)4(OH), occurring in brown to black prismatic crystals, which are often twinned in the form of a cross. [1790 1800; < Gk stauró(s) a… …   Universalium

• Metatorbernite — Green platy crystals on granite. Specimen from Redruth, Cornwall, UK General Category Phosphate minerals …   Wikipedia

• Jarosite — is a basic hydrous sulfate of potassium and iron with a chemical formula of KFe(III)3(OH)6(SO4)2. This mineral is formed in ore deposits by the oxidation of iron sulfides. Jarosite is often produced as a byproduct during the purification and… …   Wikipedia

• jasper — jasper1 /jas peuhr/, n. 1. a compact, opaque, cryptocrystalline variety of quartz, usually colored red: often used in decorative carvings. 2. Also called cameo ware, jasperware. a fine, hard stoneware introduced c1775 by Wedgwood, stained various …   Universalium

• Jasper — /jas peuhr/, n. 1. a city in NW Alabama. 11,894. 2. a resort town in SW Alberta, in SW Canada, on the Athabaska River: headquarters for Jasper National Park. 3060. 3. a male given name, form of Caspar. * * * I Opaque, fine grained or dense… …   Universalium

• polyurethane — /pol ee yoor euh thayn , yoo reth ayn/, n. Chem. a thermoplastic polymer containing the group NHCOO: used for padding and insulation in furniture, clothing, and packaging, and in the manufacture of resins for adhesives, elastomers, and fillers.… …   Universalium

• aluminum processing — Introduction       preparation of the ore for use in various products.       Aluminum, or aluminium (Al), is a silvery white metal with a melting point of 660° C (1,220° F) and a density of 2.7 grams per cubic centimetre. The most abundant… …   Universalium