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Op»' ' ,drated amor pt ют Iсит of its water content may range from 3 to лХ by weight, but is usually between 6 and 10X. Because of its «amorphous character,it H classed as a miner aloid, unlike crystalline forms of silica, whkii are classed as minerals. It is deposited at a relatively low temperature and may occur Ini tire fissures of almost any kind of rocJc, being rirost commonly found with limonlte, sandstone, rhyolite, marl, and basalt. Opal is the national, gemstone of Australia.
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