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Kyanite, whose English name is Kyanite, is derived from the Greek Kyanos, bu degani “blue”. It also has another English name, Kisthene, which also comes from Greek, bu degani “double” va “kuch”. It refers to different hardness. It shows one of the biggest characteristics of kyanite, bu, the product is in different directions on the same crystal. The hardness of the surface will vary greatly. The hardness of the crystal surface in one direction is 4.0-5.0, and the hardness of the crystal surface perpendicular to it is 6.55-7.0. This is because the mineral crystals are in different directions. It is caused by differences in internal structure, and this difference makes it known as the “two hard stones”.

Kyanite is a rare oxygen-containing salt silicate mineral. Its chemical composition is the same as that of andalusite and sillimanite. The three are homogeneous and multi-like variants, which constitute different minerals. Kyanite belongs to the triclinic crystal system. The crystals are flat columnar or flaky, and the crystal shape is often twisted or bent. The common twin crystal aggregates are massive or fibrous, with glass luster to pearl luster, transparent to translucent, and hardness 4.0-7.0. The composition of kyanite often contains iron and chromium ions, so it has obvious pleochroism. The color is light blue or dark blue, and some are yellow, gray, yashil rang, and brown. The hardness of kyanite is all-directional The opposite sex, this characteristic brings difficulties to polishing and polishing, and it will be damaged if it is done with care. Shu sababli, only a few high-quality transparent ones are used as gemstones, and they are generally used for viewing or collecting. As a gemstone, the appearance of kyanite is similar to that of sapphire and topaz, but it is not difficult to distinguish them according to their hardness, refractive index and specific gravity.

Kyanite is mainly produced in metamorphic rocks, especially gneiss and mica schist crucite, mica and quartz and other minerals symbiosis. Kyanite has good chemical stability and is not easy to be corroded, so after being weathered, it will Will be transferred to the drift sand. The main producing areas of kyanite in the world are India, Myanmar, Russia, Brazil, Switzerland, the United States, Kenya and other countries, and China also produces it, mainly in Jiangsu and Xinjiang.

 

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