2.79 Carats Australian Opal Cabochon

991

存货单位
尺寸（毫米）: 15.600 x 8.460 x 3.390mm
重量 (cts): 2.700
Treatment: No Treatment
类型: Cabochon
颜色

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. WikipediaColor: Black, Pink, White, Blue, Green, Purple, Yellow, Red, Grey, Orange, BrownLuster: Vitreous, Waxy, PearlyBirthstone zodiac sign: LibraAssociated month: OctoberCrystal system: Amorphous solidChemical formula: SiO₂·nH₂OHardness (Mohs hardness scale): 5.5 – 6.5

存货单位
尺寸（毫米）: 15.600 x 8.460 x 3.390 mm
重量 (cts): 2.700
Treatment: No Treatment
类型: Cabochon
颜色

Description

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