Opal
Opal· 蛋白石 Gem of the rainbow
Opal (English Opal, Latin opalus, Greek opallios, Sanskrit upala) is the gem of the rainbow of the decisive canon — derived from Sanskrit 'upala (gem, stone)' — the decisive canonical vocabulary — the decisive mineralogical canon of hydrated silica (SiO2·nH2O) — and the decisive canon of 'the stone containing the colors of all gems' in Pliny the Elder's Natural History Book 37 chapters 80-84 of the 1st century. Aliases — Opal (Opal), opalus (opalus), upala (upala), gem of the rainbow, queen of gems, birthstone of October — are the decisive canonical vocabulary. The decisive natural history canon is the decisive canon of 'opalus contains the fire of ruby, the green of emerald, the purple of amethyst, and the blue of sapphire, all in one stone' in Pliny the Elder's (Pliny the Elder, 23-79) Natural History (Naturalis Historia) Book 37 chapters 80-84 of the 1st century. The decisive Australian Aboriginal canon is the decisive canon of the Rainbow Serpent myth of the Australian Aboriginals (Aboriginal Australian) of over 60,000 years.