[Chemical composition] MgO 31.72%, SiO2 63.52%, H2O 4.76%. It also often contains FeO, up to 2-5%. Further, it also contains Al, Mn, Ca, and Ni. [Form] Monoclinic system. Crystals are rare, often in the form of flaky scaly or dense block aggregates. [Physical properties] White, but often with light green, light brown, light yellow and other colors. Glass luster, dense block often with waxy luster, with pearl luster inside. Hardness 1. Slip cleavage sheet is flexible. The proportion is 2.7-2.8. [Genesis and occurrence] Talc is mainly formed by hydrothermal alteration of magnesium- rich rocks such as ultrabasic rocks and dolomite . The olivine in the ultrabasic rocks and the dolomite in the dolomite can form talc by hydrothermal alteration. 4(Mg,Fe) 2 (SiO 4 )+H 2 O+CO 2 →Mg 3 [Si 4 O 10 ](OH) 2 +Mg[CO 3 ]+Fe 2 O 3 Olivine talc magnesite 3CaMg[CO 3 ] 2 +4SiO 2 +H 2 O→Mg 3 [Si 4 O 10 ](OH) 2 +3Ca[CO 3 ]+CO 2 Dolomite talc calcite In addition, talc, such as talc schist, can also be formed during regional metamorphism. [Identification Features] Features low hardness, slipperiness, light color, flake shape, and a set of extremely complete cleavage. Galvanized Welded Mesh Panel,Galvanized Wire Mesh Panel,Galvanized Welded Wire Mesh Panel,Galvanized Woven Wire Fence Panel HEBEI ANPING YONG SHENG WIRE AND NETTING MAKING CO.,LTD , https://www.yshmesh.com
talc
Talc Mg 3 [Si 4 O 10 ](OH) 2