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Learn about opal, a colorful and unique gemstone that contains water and silica spheres. Discover its history, lore, quality factors, and research from GIA experts.
Learn about opal, a popular and colorful gemstone with a unique play-of-color phenomenon. See pictures of different types of opal, such as precious, fire, boulder, black, and common opal, and find out where they are mined.
Opal is a hydrated amorphous form of silica (SiO 2 · n H 2 O); its water content may range from 3% to 21% by weight, but is usually between 6% and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals.
OPAL es una entidad que asesora al Senado y la Cámara de Representantes de Puerto Rico en temas presupuestarios, financieros y económicos. Prepara informes de efecto fiscal de las medidas y propuestas legislativas y ofrece herramientas digitales con datos actualizados.
Learn about opal's unique properties, value, price, and care. Find out the difference between precious and common opal, the types of opalized fossils, and the history of opal jewelry.
OPAL es una empresa francesa que diseña y distribuye gafas para niños y adolescentes desde 1995. Ofrece marcas como Barbie, Demetz y otros, así como servicios para los ópticos.
Learn how opal forms, what types of opal exist, and how to identify play-of-color. See stunning photos of opals from Australia and other sources.
