Industry: Gemstone

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. Color: Black, Pink, White, Green, Purple, Blue, Grey, Yellow, Red, Orange, Brown Luster: Vitreous, Waxy, Pearly Birthstone zodiac sign: Libra Associated month: October Crystal system: Amorphous solid Chemical formula: SiO₂·nH₂O Hardness (Mohs hardness scale): 5.5 – 6.5

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