Opal - Wikipedia
WEBOpal is a hydrated amorphous form of silica that may show iridescent flashes of color due to its internal structure. Learn about the types, properties, formation, and uses of opal, a precious gemstone and a mineraloid.
Opal : Properties, Formation, Uses and Deposits - Geology Science
WEBJul 1, 2024 · Opals are mineraloids composed of tiny spheres of silica that exhibit a stunning play of color, known as opalescence. Learn about their historical significance, formation, occurrence, types, uses and famous examples.
Pictures of Opal - Black, Fire, Boulder, Blue and Pink - Geology.com
WEBOpal is a hydrous silicon dioxide with a variable amount of water and a unique play-of-color phenomenon. Learn about the different types of opal, their sources, their physical and chemical properties, and see pictures of opal gemstones.
Opal: The mineral Opal (black, white, fire) information and pictures
WEBOpal is a mineraloid composed of tiny silica spheres that diffract light and produce color play. Learn about its chemical formula, crystal system, crazing, fluorescence, and many varieties, such as black, fire, and crystal opal.
14 Different Types Of Opal And What They All Look Like - Rock …
WEBJan 3, 2024 · Opal is a mineral with unique play-of-color, formed from silica and water. Learn about 14 different types of opal, from white to fire, and where to find them in the world.
Opal Gemstone | Opal Stone - GIA
WEBLearn about opal, a colorful and unique gemstone that contains water and silica spheres. Discover its history, lore, quality factors, and research from GIA experts.
Opal | Properties, Types & Uses | Britannica
WEBAug 14, 2024 · Opal is a silica mineral with various colours and opalescence, formed by impurities or cracks in the crystal structure. Learn about its history, distribution, forms, and uses as a gemstone and an abrasive.
Opal Gemstones: History, Symbolism, Meanings & More
WEBAug 28, 2021 · Opal is a mineraloid composed of silica and water. Most opals you’ll come across are 6-10% water. Stable opals can have as low as 3% water content and as high as 21%. Under a microscope, opal contains stacks of hydrated silica spheres aligned together like a Buckyball cube.
Opal - The Colorful Silica - MineralExpert.org
WEBMay 25, 2016 · Opal is a form of amorphous or microcrystalline silica with a wide range of colors and play of color. Learn about its crystal structure, classification, diagenesis, physical properties and history as a gemstone.
Opal Description - GIA
WEBLearn how opal forms, what types of opal exist, and how to identify play-of-color. Opal is a gemstone that displays flashing rainbow colors due to its unique structure of sub-microscopic spheres.