Talc is a hydrous magnesium silicate mineral with the chemical composition Mg3Si4O10 (OH) 2. Although the chemical composition of talc usually remains close to this general formula, some substitutions do occur. A small amount of Al or Ti can replace Si, a small amount of Fe, Mn and Al can replace Mg; And very small amounts of Ca can replace Mg. When large amounts of Fe replace Mg, the mineral becomes known as Minnesota. When large amounts of Al replace Mg, the mineral is known as pyrophyllite.
\nTalc is usually green, white, gray, brown or colorless. Talc is a translucent mineral with a pearly sheen. Talc is the softest known mineral and has a hardness of one in the mouse hardness table.
\nTalc is a monoclinic mineral with a similar plate structure. Talc has a full face that forms along the plates between weakly bonded sheets. These sheets are held together by a van der Waals bond that allows them to slide freely on top of each other. This causes the talc to be very soft, soapy to the touch, greasy, and valuable as a high temperature lubricant.
\nPhysical properties of talc
\nGreen, white, gray, brown, colorless
\nKhaki white to matte green color
\nPearl polish
\nSemi-transparent transparency
\nFull occurrence
\nHardness one
\nSpecific weight 2.8 to 2.7
\nUnique features touch, color, softness, cleavage
\nMonoclinic crystal system<\/p>\n","protected":false},"excerpt":{"rendered":"
Talc is a hydrous magnesium silicate mineral with the chemical composition Mg3Si4O10 (OH) 2. Although the chemical composition of talc<\/p>\n","protected":false},"author":11,"featured_media":7316,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[95],"tags":[],"class_list":["post-7315","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\n