A. Quartz group.
Quartz is a rock formimg mineral.The crystals are trigonal. The prisms are 6 sided.
Gemstone Name :Amethyst.
Colour ranges from colourless to deep royal purple. Amethyst got
its name from "Amethustos" which means "Not drunken"
in Greek. In ancient days it was believed that a man wearing amethyst
could never get drunk however much he drinks.
Hardness = 7 ; Specific gravity
Colour : The viloet colour is due to the presence of Iron.
Found in : UK, Brazil, Madagascar, France and