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Opal
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Opal – mineraloid zaliczany do krzemianów. Nazwa pochodzi od sanskryckiego upala = drogi kamień, kamień szlachetny; bądź od gr. opallios = widzieć zmianę. Opal jest oficjalnym kamieniem szlachetnym Australii. Wikipedia
Barwa: bezbarwny, biały, żółty, zielony, niebieski, wielobarwny
Gęstość minerału: 1,9-2,2 (2,15) g/cm³
Inne: od nieprzejrzystego do przejrzystego
Łupliwość: brak
Pokrój kryształu: skupienia groniaste, żyły, pseudomorficzny
Rysa: biała
Skład chemiczny: SiO2·nH2O - Uwodniona krzemionka
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Opal – mineraloid zaliczany do krzemianów. Nazwa pochodzi od sanskryckiego upala = drogi kamień, kamień szlachetny; bądź od gr. opallios (łac. opalus) ...
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