opal İngilizcesi nedir yazılışı

opal.

A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity. a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones.

Opals are semi-precious stones that are luminous and iridescent, frequently with inclusions of many colors Opal is a mineral composed of noncrystalline silica and is a species of quartz There are three major types of opals: common opal, opalescent precious opal , and fire opal Contra luz opals are transparent opals that show a brilliant play of iridescence only when light shines through the stone Many opals have a high water content - they can dry out and crack if they are not cared for well Opals have a hardness of 5 5 to 6 5 and a specific gravity of 1 98-2 50 Opals are found in many placees worldwide, but Australia has a tremendous variety of beautiful opals.

An amorphous form of quartz unstable at temperatures and pressures found on the surface of the earth. is a precipitated non-crystalline variety of silica, precious varieties of which characteristically display a marked variety of changing colours and are used as gemstones, especially when cut and polished.

An amorphous hydrous silica which is common; gem varieties such as fire opal, have the ability to show colors in their interior and are very valuable.

An amorphous form of silica.

White, gray and Black The white opal is well known and stones can display faint flashes of colour to a bright kaleidoscope of a single colour to many The gray or black based are more rare and more expensive and as colour display increases so does the price.

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Precious stone used in jewelry crafts Colors range from white to mixtures that include black. a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones.