the complete classification of minerals geology in

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What is Topaz? Topaz is a rare silicate mineral with a chemical composition of Al 2 SiO 4 (F,OH) 2.It is best known for three things: 1) being one of the world's favorite colored gemstones; 2) being mineral number 8 in the Mohs Scale of Hardness; and, 3) being a birthstone for the month of November.. Topaz obtains much of its popularity from its beautiful colors and its status as a …

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