The opal is a naturally hardened silica gel containing 5-10% moisture. Unlike most gemstones, opals are amorphous and gradually dry out and crack due to moisture loss from the gemstone. Opal is an opal in mineralogy. It is a gemstone with a color changing effect and is an aqueous amorphous silica.
The opal is a gemstone, the English name is opal, and the Chinese transliteration is Opal. The opal is a hydrate of silica, the composition of which is SiO2·nH2O, which is amorphous, so it has no shape, and the fracture is shell-like, mainly formed by the colloidal precipitation of silica. If it is precipitated in the biological remains, then Form a "tree jade."
The chemical composition is SiO2·nH2O, and the water content is generally 3%-10%.
Opal crystal system: amorphous
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 a naturally hardened silica gel containing 5-10% moisture. Unlike most gemstones, opal is amorphous and will gradually dry out and crack due to moisture loss from the gemstone.
Opal is an opal in mineralogy. It is a gemstone with a color changing effect and is an aqueous amorphous silica. It has no fixed shape and is often dense, granular, earthy, stalactite, tuberculous, porous and so on.
The interior has a spheroidal structure, and the aggregates are mostly grape-like and stalactite-like. The background color is black, milky white, light yellow, orange and so on. Translucent to slightly transparent. Glass luster, pearl luster, protein luster. With a color change effect. Sexually brittle, easy to dry, shell-like fracture. Different types of opals emit different colors of fluorescence under long-wave ultraviolet radiation.
There are two variants: precious opal and common opal.
The precious opal will show a color flash (i-color) due to the different viewing angles. Its iridescence is caused by its structure - a tiny arrangement of tiny silica spheres - which is caused by diffracted light. The larger the sphere, the more the color range Wide, so the precious opal has several different colors.
In ancient times, Chinese people loved opals very much, especially during the Ming and Qing Dynasties, and regarded it as a palace treasure.
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