![]() Please see our articles about common opal and fire opal for much more information and lots of photos. ![]() Some transparent specimens of common opal have a color and clarity that makes them worthy of being cut into faceted gems. Play-of-color is not needed for common opal to be used as a gem material. However, some specimens of natural common opal have a wonderful color, accept a bright polish, and can be cut into highly desirable gems (see the photo at the top of this page). It is deposited at a relatively low temperature and may occur. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals. Yellow dendritic opal gemstone 925 sterling silver designer handcraft bezel set pendant, You can get more details about from mobile site on m. n H 2 O) its water content may range from 3 to 21 by weight, but is usually between 6 and 10.Most of it is a white to yellow to brown material that is usually not considered for use as a gem. Opal is a hydrated amorphous form of silica (SiO 2 (The first use of the word opalite as a marketing term for man-made materials occurred in the 1980s.)Ĭommon opal is found in many locations throughout the world. It is defined as a natural common opal that does not show play-of-color. ad vertisement by AllPureSoul Ad vertisement from shop AllPureSoul AllPureSoul From shop AllPureSoul. This predates the use of the word opalite as a marketing term for an imitation opal. Raw, Natural Yellow Opal with Dendritic, weighs 58 grams, 290 Cts. The name opalite was defined as common opal in geology and gemology glossaries as early as 1945.
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