Gems
Solid Gem Black Opal from Lightning Ridge Opal is a hydrated amorphous form of silica; its water content may range from 3% to 21% by weight, but is usually between 6% to 10%. Because of its amorphous character it is classed as a mineraloid, unlike the other crystalline forms of silica which are classed as minerals. ❦ CRYSTALS ❦ semi precious stones ❦ Kristall ❦ Minerals ❦ Cristales ❦
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