Dereck at EBAFF, Bronx, NY
06/03/2008
“ AMETHYST, the purple variety of quartz VARIETY INFORMATION: * Variety of: Quartz , SiO2 . * Uses: Gemstones and ornamental stones. * Birthstone for: February * Color: various shades of purple. * Index of refraction: 1.544-1.553 * Birefringence: 0.009 * Hardness: 7 * Cleavage: none * Crystal system: trigonal * Pleochroic: no „
AMETHYST a gemstone variety of quartz
1. this rock is gray and it is pointed gems on it.
2.the rock is heavy and its cold.
3.the outside of the rock is agreenish color and is rough tothe touch.
Quote posted at 09:39
