Reference to the GIG Research Report: Opal as a gemstone, English name opal, transliterated as Opal, Opal. It is a hydrate of silica, and its composition is SiO2·nH2O. It has an amorphous structure, so it has no specific shape. The fracture is shell-like, mainly formed by colloidal precipitation of silica. If precipitated in biological remains, it is formed. "Tree jade", precipitated in the remains of Conch, forms a "spiral jade", which is rarely found in Hainan. The locals call it snail fossil or sea jade, which is extremely rare because of the scarcity.
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Refractive index: 1.37-1.47 (The refractive index is related to its water content, and its refractive index decreases as the water content increases)
Hardness: 5.5-6.5
Density: 2.15-2.23g/cm3
The opal is generally egg white. If other atoms are mixed in, it can form various colors, such as iron, calcium, magnesium, copper, etc. The opal generally has a glass luster or a waxy luster. If the color luster changes with angle, it is valuable. The gems are otherwise just decorative stones.
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