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. 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. 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. Opals are often dense, granular, earthy, stalactite, tuberculous, porous, and the like. 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. The quality evaluation of opal is based on the base color, color change, firmness, and the perfection of cutting and honing. what makes most electric power tools "different" from one another depends on how the physical energy is used, or its application. The process of making physical energy with electrical energy is very similar and where most performance issues occur. for most power tools, and happens to be where most maintenance is required Power Tool Carbon Brush,Black Carbon Brush,Bosch Carbon Brush,Dewalt Carbon Brush Haimen Hailing Carbon Industry Co., Ltd. , http://www.carbonbrush-hl.com
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