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Outstanding Rough Opal From Oregon, US - Types of opal  photo: Amazing Geologist page on facebook  Opal  is a hydrated amorphous form of silica (SiO2·nH2O), Because of its  amorph... Cool Rocks, Pretty Rocks, Beautiful Rocks, Beautiful Pictures, Minerals And Gemstones, Rocks And Minerals, Jelly Opal, Types Of Opals, Mineral Stone
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Types of Opal With Photos

There are many different types of natural opals. There is black opal, white opal, crystal opal and jelly opal. There are other kinds - fire opal, hyalite, water opal, hydrophane… 
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