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Corundum vs. Topaz

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Corundumnoun

(mineral) An extremely hard mineral, a form of aluminum oxide with the chemical formula Al2O3, that occurs in the form of the gemstones sapphire and ruby; it is used as an abrasive.

Topaznoun

A silicate mineral of aluminium and fluorine, usually tinted by impurities.

Corundumnoun

The mineral alumina (Al2O3), as found native in a crystalline state. Transparent varieties are used as gemstones, including sapphire, which is the fine blue variety; the oriental ruby, or red sapphire; the oriental amethyst, or purple sapphire; and adamantine spar, the hair-brown variety. It is the hardest substance found native, next to the diamond.

Topaznoun

An often clear, yellowish-brown gemstone cut from this.

Corundumnoun

very hard mineral used as an abrasive

Topaznoun

A yellowish-brown color, like that of the gemstone.

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Corundum

Corundum is a crystalline form of aluminium oxide (Al2O3) typically containing traces of iron, titanium, vanadium and chromium. It is a rock-forming mineral.

Topaznoun

A black Catholic soldier in the British Army.

Topazadjective

Of a yellowish-brown color, like that of the gemstone.

Topaznoun

A mineral occurring in rhombic prisms, generally yellowish and pellucid, also colorless, and of greenesh, bluish, or brownish shades. It sometimes occurs massive and opaque. It is a fluosilicate of alumina, and is used as a gem.

Topaznoun

Either one of two species of large, brilliantly colored humming birds of the genus Topaza (Topaza pella or Topaza pyra), of South America and the West Indies.

Topaznoun

a yellow quartz

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Topaznoun

a mineral (fluosilicate of aluminum) that occurs in crystals of various colors and is used as a gemstone

Topaznoun

a light brown

Topaznoun

a dark yellow colour

‘bright topaz eyes’;

Topaznoun

a large tropical American hummingbird with a yellowish throat and a long tail.

Topaz

Topaz ( TOH-paz) is a silicate mineral of aluminium and fluorine with the chemical formula Al2SiO4(F, OH)2. It is used as a gemstone in jewelry and other adornments.

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