16.50 Carats Australian Boulder Opal Cab

Item Information

Dimensions (mm) 25.58 x 13.77 x 5.38mm
Weight (carats) 16.5 carats
  • No Treatment


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

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Pricing & Details

Bid Increment $1
Starting Bid $1
Auction ID 1423463
Watchers 6 watching
Viewed 900 times
Starts 17th Mar 2023 7:11am PDT
Ends 31st Mar 2023 7:11am PDT

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