Opal is a hydrated amorphous form of silica; 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.
Deck Information
Deck/File Name: Opals (opals )
Set/Series: Gems and Minerals
Made/Donated by: Aki / MioColor: LightSteelBlue
Released: 2021-03-06Masterable: Yes
Wished by: None
Mastered by: Mio, Aki, Mysti, saya, Lina, Lex
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