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Explanation

A silicate mineral with island structure. The general formula of its chemical composition is A3B2 [SiO4] 3, where A can be Mg2+(magnesium), Fe2+(iron), Mn2+(manganese), etc., while B can be Al3+(aluminum), Fe3+(iron), V3+(vanadium), etc. garnet has a wide range of isomorphic substitution phenomena, mainly divided into two categories: iron aluminum series, including magnesium aluminum garnet (Mg3Al2 [SiO4] 3), iron aluminum garnet, manganese aluminum garnet, etc. Calcium iron series, including calcium aluminum garnet (Ca3Al2 [SiO4] 3), calcium iron garnet, calcium chromium garnet, calcium vanadium garnet, etc. There are also rare ferromanganese garnet and magnesia chromite garnet. When the content of TiO2 in calcium iron garnet reaches 4.60% to 16.44%, it is called schorlomite; When TiO2 is between 1% and 5%, it is called melanile. When the water content reaches 8.5%, it is called water garnet. garnet is an equiaxed system with a specific crystal structure. The color of garnet is generally reddish brown to purple red or yellow brown. garnet containing chromium and vanadium appears green, while calcium iron garnet appears yellow green. It has glass luster and fracture grease luster. The Mohs hardness is 5.6 to 7.5, which belongs to relatively hard minerals, while the density is 3.5 to 4.2 g/cm 3 Between. garnet of calcium iron series is mainly produced in skarn, often associated with diopside, and also associated with ortho feldspar and nepheline in alkaline rock. garnet of iron Al series mainly occurs in schist, gneiss and eclogite. magnesia almandine can be found in kimberite and is often used as an indicator mineral for diamond. Calchromite occurs in ultrabasic rock and can be used as an indicator mineral for searching chromite. Melanile and schorlomite occur in alkaline intrusive rocks. Because of its high hardness and bright colors, garnet can be used as an abrasive, and beautiful garnet can also be used as a gems.

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Classification