Aventurine chemical formula (SiO2) Scientific name: lapis lazuli, also known as ocean stone or Dongling stone, was originally produced in India, hence the name "Indian jade". The scientific name is lapis lazuli and is also a member of the crystal family. The contents thereof usually have microcrystals, pyrite, and the like. Dongling stone is currently available in green and red, mostly opaque, and occasionally partially translucent, with hardness similar to crystal. The green Dongling stone was once known as the Indian jade, and its chemical composition is mainly silica, which belongs to quartzite. The green color of the Dongling stone is not correct, and there are bright dots on it. The density is lower than that of jade, and its price is far less than that of high quality jade.
It is a quartzite with a gold effect, and the color varies depending on the impurity minerals contained. The chrome-containing mica is green, called the green dongling stone; the blue-lined stone is blue, called the blue dongling stone; the lithium-containing mica is purple, called the purple dongling stone. The green Dongling stone produced in Xinjiang, China contains green fibrous anomalous. In general, the quartz particles of Dongling Stone are relatively thick, and the minerals contained therein are relatively large. In the sunlight, the flake minerals can exhibit a glittering gold effect. The most common in the domestic market is the green dongling stone produced in India. Under the magnifying glass, the coarse chrome mica flakes can be clearly seen, which are roughly oriented and slightly brownish under the color filter. The standard chemical composition of Dongling Stone is mainly SiO2; the mineral composition is mainly quartz, and the chromium-containing mica is about 10%-18%. It also contains trace amounts of blue line stone, sillimanite, rutile, hematite, zircon and so on. Since the chrome mica is very small (0.2-2 mm in diameter) scaly and the distribution is relatively uniform, the Dongling stone is brightly oily green and greenish green. It has a strong grease luster and glass luster, translucent to slightly transparent. The refractive index is about 1.544-1.560. Hardness 7, density 2.65-2.8 g / cm3. Sex is more brittle. The texture is dense, delicate, tough and smooth. After polishing, the radiant dots (rutile, hematite, chrome mica, etc.) shine on the background of the oil green, which is very beautiful. This small point is commonly known as the "eye" and is about 1 mm smaller. High-quality Dongling stone tends to have more "eyes" and evenly flashes on the background of oil green.
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