Na3AlF6 / Monoclinic - Prismatic
This is the most powerful crystal that is also affordable. If you do not feel cryolite you are dead - this crystal just makes non-believer into believers. It fills the body with radiant white light and makes all your cells vibrate.
From the Greek κρύος, frost, and λίθος, stone, meaning "ice-stone" in allusion to its appearance. There were mostly found in Greenland, but also some in Canada, Russia and Namibia.
