Topaz

Formula: Al2(SiO4)(F,OH)2
System: Orthorhombic
Hardness: 8
Name: Named after Topasos Island in the Red Sea. In antique times, the name was probably used for the gemstone that is now known as peridot.

Topaz is a mineral formed by fluorine-bearing vapors given off during the last stages of solidification of siliceous igneous rocks. 

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