18.99 Carats Full Fire Opal Cabochon

Item Information

Dimensions (mm) 20.68 x 20.68 x 10.72mm
Weight (carats) 18.99 carats
Colors

Description

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. Wikipedia
Color: Black, Pink, White, Blue, Green, Purple, Yellow, Red, Grey, 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

$800.00 USD

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Audit Information

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Pricing & Details

Auction ID 1202402
Watchers 3 watching
Viewed 278 times
Starts 19th May 2020 9:55am PDT

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