Scratcher Joined 2 years, 1 month ago Antarctica

About me

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 m

What I'm working on

ineraloid, 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 commo

What I've been doing


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