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Mineral Name Variety Locality
Opal Yellowstone National Park, Wyoming
Opal Geyserite Yellowstone National Park, Wyoming
Opal Tripolite Seneca, Missouri
Opal Opal Douglas Co., Washington
Opal Opal Ontario, Canada
Opal Petrified wood Libethen (Ľubietová), Slovakia
Opal Opal Washington Co., Georgia
Opal Opal Yellowstone National Park, Wyoming
Opal Geyserite Yellowstone National Park, Wyoming
Opal Opal South Park, Colorado
Opal Yellowstone National Park, Wyoming
Opal Mexico
Opal Opal Unknown Locality
Opal Opal Yellowstone National Park, Wyoming
Opal Opal Yellowstone National Park, Wyoming
Opal Opal Crystal Peak, Colorado
Opal Opal Waltsch (Valeč), Czech Republic
Opal Hyalite Waltsch (Valeč), Czech Republic
Opal Washington Co., Georgia
Opal Semiopal Angaston, South Australia
Opal Washington Co., Georgia
Opal Opal Yellowstone National Park, Wyoming
Opal Opal Yellowstone National Park, Wyoming
Opal Isopyre Morris Co., New Jersey
Opal Opal Cairo, Egypt
Opal Cecil Co., Maryland
Opal Clark Co., Nevada
Opal Hyalite Crystal Peak, Colorado
Opal Tinaquillo, Venezuela
Opal Petrified wood California , USA
Opal Opal Meronitz (Měrunice), Czech Republic
Opal   White Cliffs, New South Wales
Opal Wood opal Unknown Locality
Opal Milk opal Červenica, Slovakia
Opal Opal Unknown Locality
Opal Tripolite slate Bílina (Bilin), Czech Republic
Opal Tripolite slate Algiers, Algeria
Opal Geyserite Yellowstone National Park, Wyoming
Opal Inyo Co., California
Opal Geyserite Yellowstone National Park, Wyoming
Opal Opal Waltsch (Valeč), Czech Republic
Opal Semiopal Douglas Co., Washington
Opal Petrified wood Nevada Co., California
Opal Pealite Yellowstone National Park, Wyoming
Opal Geyserite Yellowstone National Park, Wyoming
Opal Semiopal Leadville, Colorado
Opal Opal Lutila, Slovakia
Opal Opal Libethen (Ľubietová), Slovakia
Opal Semiopal Douglas Co., Washington
Opal Tuscan Springs, Tehama Co., California
Opal Opal Tokaj, Hungary
Opal Opal Querétaro, Mexico
Opal Geyserite Yellowstone National Park, Wyoming
Opal Geyserite Yellowstone National Park, Wyoming
Opal Köselitz, Germany
Opal Frankenstein (Ząbkowice), Poland
Opal Opal Querétaro, Mexico
Opal Hyalite Kaiserstuhl, Germany
Opal Unknown Locality
Opal Hyalite Waltsch (Valeč), Czech Republic
Opal Semiopal Douglas Co., Washington
Opal Opal Unknown Locality
Opal Hyalite Büdigheim, Hesse, Germany
Opal Stránka, Czech Republic
Opal Bílina (Bilin), Czech Republic
Opal Geyserite Yellowstone National Park, Wyoming
Opal Saxony, Germany
Opal Geyserite Yellowstone National Park, Wyoming
Opal Saxony, Germany
Opal Petrified wood Unknown Locality
Opal Unknown Locality
Opal Yellowstone National Park, Wyoming
Opal Unknown Locality
Opal Unknown Locality
Opal Fire Opal Querétaro, Mexico
Opal Stamford, Connecticut
Opal Algiers, Algeria
Opal Opal Eibenstock, Saxony, Germany
Opal Ferromonte, New Jersey
Opal Tripolite slate France
Opal Unknown Locality
Opal Prase Tyrol, Austria
Opal Ferromonte, New Jersey
Opal Floatstone France
Opal Opal Carlsbad (Karlovy Vary), Czech Republic
Opal Opal Köselitz, Germany
Opal Semiopal Unknown Locality
Opal Opal Unknown Locality
Opal Opal
Opal Červenica, Slovakia
Opal Opal Germany
Opal Hyalite Crestmore Quarry, California