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mining techniques about topaz wikipedia

mining techniques about topaz wikipedia

Topaz is a silicate mineral of aluminium and fluorine with the chemical formula Al 2 Si O 4 F OH crystallizes in the orthorhombic system and its crystals are mostly prismatic terminated by pyramidal and other faces It is one of the hardest naturally occurring minerals Mohs hardness of 8 and is the hardest of any silicate hardness combined with its usual transparency


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