It is transparent with a vitreous luster, and it has perfect cleavage on the basal pinacoid.  
It is transparent with a vitreous luster, and it has perfect cleavage on the basal pinacoid.  An aluminum silicate mineral with fluorine or hydroxide radicals, its crystals are orthorhombic and occur in metamorphic and acidic igneous rocks.  Citrine quartz and other stones of a similar color are often mistaken for it, and it can become permanently "pinked" when heated.  FTP, name this mineral with Mohs hardness eight, the birthstone for November.
It is transparent with a vitreous luster, and it has perfect cleavage on the basal pinacoid.  
topaz