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Depending on the properties: color, gloss, transparency, hardness, impurities, a fairly significant number of varieties are distinguished opals . Opals , formed from the silica of weathered silicate rocks, filling cracks and voids in them or penetrating into their mass, are" impure ". These include: semi-opal, cloudy, with a greasy sheen, white, gray, yellow, red and brown; opal jasper , which is colored red or brown by an admixture of a significant amount of iron oxides. Soaking wood residues produces woody opal , which has the structure of a tree (petrified wood). The porous, spongy varieties formed from hot springs are called siliceous tuff and siliceous scale. Earthy, loose deposits of microscopic organisms, mainly diatoms, are called tripoli, polishing shale. Noble opal is distinguished by its beautiful andSeveral flowers. The color is, for the most part, milky white or yellowish, blue and even black. Translucent or translucent. Refers to precious stones. Ordinary opal has no play of colors. Transparency to varying degrees. Sometimes colorless, but for the most part, it is painted in various dull colors. Beautiful specimens are polished and are considered semi-precious stones . Most of the noble opals are mined in Australia, Mexico, Brazil , Guatemala, Honduras, Japan, Czech Republic, USA (Nevada), minor manifestations in Russia (Kamchatka) and Ukraine.

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