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词汇 Opal triplet
分类 英语词汇 英语翻译词典
释义

Opal triplet

英语百科

Opal

Precious opal consists of spheres of silicon dioxide molecules arranged in regular, closely packed planes. (Idealized diagram)
Multicolor rough crystal opal from Coober Pedy, South Australia, expressing nearly every color of the visible spectrum
Brightness of the fire in opal ranges on a scale of 1 to 5 (5 being the brightest)[10]

Opal is a hydrated amorphous form of silica (SiO2·nH2O); its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Because of its amorphous character, it is classed as a mineraloid, unlike crystalline forms of silica, which are classed as minerals. It is deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl, and basalt. Opal is the national gemstone of Australia.

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