willemite

wil·lem·ite

W0159800 (wĭl′ə-mīt′)n. A colorless, vitreous to resinous, often fluorescent mineral, Zn₂SiO₄, a minor ore of zinc.

[Dutch willemit, after Willem I (1772-1843), king of the Netherlands.]

willemite

(ˈwɪləˌmaɪt) n (Minerals) a secondary mineral consisting of zinc silicate in hexagonal crystalline form. It is white, colourless, or coloured by impurities and is found in veins of zinc ore. Formula: Zn2SiO4[C19: from Dutch willemit, named after Willem I of the Netherlands (1772–1843)]

wil•lem•ite

(ˈwɪl əˌmaɪt)

n. a zinc silicate mineral, Zn₂SiO₄, yellow-green to red in color, and massive or crystalline in form. [1835–45; < Dutch willemit (1829), after King Willem (William I of Orange); see -ite¹]

Willemite

willemite

[′wil·ə‚mīt] (mineralogy) Zn₂SiO₄ A white, greenish-yellow, green, reddish, or brown mineral that forms rhombohedral crystals and exhibits intense bright-yellow fluorescence in ultraviolet light; a minor ore of zinc.

Willemite

(after King Willem I of the Netherlands), a mineral, Zn₂SiO₄ (73.0 percent ZnO, 27.0 percent SiO₂). Admixtures of Mn²⁺ are common. Crystallizes in a trigonal system. The structure is complex, composed of tetrahedrons of SiO₄ and ZnO₄ linked by common oxygens. Prismatic or acicular crystals are rare; they are usually granular or radial-fibrous aggregates, incrustations, and so on.

Willemite is colorless, greenish, or yellowish brown, and it phosphoresces brightly in ultraviolet light or cathode rays. Hardness on the mineralogical scale, 5-6; density, 3,890-4,180 kg/m³. It formed both in oxidation zones of lead-zinc deposits and in certain contact-metasomatic deposits (at Franklin in the USA). It is used as a zinc ore. It is also used to make fluorescent screens in cathode-ray tubes and other instruments.

单词	willemite
释义	willemite wil·lem·ite W0159800 (wĭl′ə-mīt′)n. A colorless, vitreous to resinous, often fluorescent mineral, Zn₂SiO₄, a minor ore of zinc. [Dutch willemit, after Willem I (1772-1843), king of the Netherlands.] willemite (ˈwɪləˌmaɪt) n (Minerals) a secondary mineral consisting of zinc silicate in hexagonal crystalline form. It is white, colourless, or coloured by impurities and is found in veins of zinc ore. Formula: Zn2SiO4[C19: from Dutch willemit, named after Willem I of the Netherlands (1772–1843)] wil•lem•ite (ˈwɪl əˌmaɪt) n. a zinc silicate mineral, Zn₂SiO₄, yellow-green to red in color, and massive or crystalline in form. [1835–45; < Dutch willemit (1829), after King Willem (William I of Orange); see -ite¹] Willemite willemite [′wil·ə‚mīt] (mineralogy) Zn₂SiO₄ A white, greenish-yellow, green, reddish, or brown mineral that forms rhombohedral crystals and exhibits intense bright-yellow fluorescence in ultraviolet light; a minor ore of zinc. Willemite (after King Willem I of the Netherlands), a mineral, Zn₂SiO₄ (73.0 percent ZnO, 27.0 percent SiO₂). Admixtures of Mn²⁺ are common. Crystallizes in a trigonal system. The structure is complex, composed of tetrahedrons of SiO₄ and ZnO₄ linked by common oxygens. Prismatic or acicular crystals are rare; they are usually granular or radial-fibrous aggregates, incrustations, and so on. Willemite is colorless, greenish, or yellowish brown, and it phosphoresces brightly in ultraviolet light or cathode rays. Hardness on the mineralogical scale, 5-6; density, 3,890-4,180 kg/m³. It formed both in oxidation zones of lead-zinc deposits and in certain contact-metasomatic deposits (at Franklin in the USA). It is used as a zinc ore. It is also used to make fluorescent screens in cathode-ray tubes and other instruments.
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