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Aprende sobre el ópalo, una piedra preciosa que muestra un juego de colores deslumbrante por la luz. Descubre sus tipos, su origen, su valor y sus diferencias con el ópalo común.
OPAL es la Oficina Presupuesto de la Asamblea Legislativa, encargada de analizar el efecto económico de las medidas ante la consideración de los legisladores. En su portal, ofrece informes, herramientas y datos sobre el presupuesto, las finanzas, los impuestos y la economía de la Isla.
Learn about opal, the October birthstone that displays all the colors of the rainbow. Find out how opal forms, interacts with light, and is valued for its play-of-color, pattern, and quality factors.
Learn about the different types of opal, their physical properties, and how they display play-of-color. See pictures of opal in various colors and forms, from black to pink, from common to precious. Find out how to care for opal as a gemstone and where to buy it.
Opal is a hydrated amorphous form of silica (SiO 2 ·nH 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.
Learn about the unique properties, history, and value of opal gems, the most delicate and colorful gemstones commonly worn. Find out how to identify, appraise, and buy opals of different types, such as black, fire, crystal, and boulder opals. Discover the difference between common and precious opals, and the meaning of opal's play of colors.
Learn how opal forms, what types of opal exist, and how to identify their play-of-color. Opal is a gemstone with flashing rainbow colors caused by the refraction of light through spheres of silica in the stone.
