“fluorite”的概念、定义、翻译、参考文献-科学参考

fluorite

Astronomy

Calcium fluoride crystal, used as an optical material. Objective lenses made from fluorite are particularly free from chromatic aberration, since fluorite has approximately half the dispersion of crown glass. Its drawbacks are that it is very expensive and is attacked by water, so fluorite elements must be sealed between other elements.

Chemistry

A mineral form of calcium fluoride, CaF₂, crystallizing in the cubic system. It is variable in colour; the most common fluorites are green and purple (blue john), but other forms are white, yellow, or brown. Fluorite is used chiefly as a flux material in the smelting of iron and steel; it is also used as a source of fluorine and hydrofluoric acid and in the ceramic and optical-glass industries.

Geology and Earth Sciences

Mineral, CaF₂; sp. gr. 3.2; hardness 4; cubic; often yellow, green, blue, or purple, but can be colourless, pink, red, or black, and often colour banded; white streak; vitreous lustre; crystals often cubes, but can be octahedra and rhombododecahedra, and a mixture of forms; cleavage perfect {111}; widely distributed in mineral veins alone or as a gangue mineral with metallic ores, and in association with quartz, barite, calcite, galena, cassiterite, sphalerite, and many other minerals; soluble in sulphuric acid with the evolution of hydrogen sulphide. It is used extensively as a flux in the smelting of iron, in the ceramic industry, and in the chemical industry. The deep-purple, banded variety, Blue John, is used as an ornamental stone.

单词	fluorite
释义	fluorite Astronomy Calcium fluoride crystal, used as an optical material. Objective lenses made from fluorite are particularly free from chromatic aberration, since fluorite has approximately half the dispersion of crown glass. Its drawbacks are that it is very expensive and is attacked by water, so fluorite elements must be sealed between other elements. Chemistry A mineral form of calcium fluoride, CaF₂, crystallizing in the cubic system. It is variable in colour; the most common fluorites are green and purple (blue john), but other forms are white, yellow, or brown. Fluorite is used chiefly as a flux material in the smelting of iron and steel; it is also used as a source of fluorine and hydrofluoric acid and in the ceramic and optical-glass industries. Geology and Earth Sciences Mineral, CaF₂; sp. gr. 3.2; hardness 4; cubic; often yellow, green, blue, or purple, but can be colourless, pink, red, or black, and often colour banded; white streak; vitreous lustre; crystals often cubes, but can be octahedra and rhombododecahedra, and a mixture of forms; cleavage perfect {111}; widely distributed in mineral veins alone or as a gangue mineral with metallic ores, and in association with quartz, barite, calcite, galena, cassiterite, sphalerite, and many other minerals; soluble in sulphuric acid with the evolution of hydrogen sulphide. It is used extensively as a flux in the smelting of iron, in the ceramic industry, and in the chemical industry. The deep-purple, banded variety, Blue John, is used as an ornamental stone.
随便看	Schuster, Sir Arthur Schwabe, (Samuel) Heinrich (1789–1875) Schwann cell Schwann, Theodor Schwartz distribution Schwartz, Melvin Schwarz criterion Schwarzenberg, Felix (1800–52) Schwarzenberg, Karl Philipp (1771–1820) Schwarz, John Henry Schwarzschild black hole Schwarzschild, Karl Schwarzschild, Karl (1873–1916) Schwarzschild radius Schwarzschild telescope Schwassmann–Wachmann 1, Comet 29P/ Schwassmann–Wachmann 3 Schweickart, Russell Louis (1935– ) Schweizer’s reagent Schwinger action principle Schwinger effect Schwinger, Julian Seymour Schönbein, Christian Friedrich Schönberg–Chandrasekhar limit schönite