Painite is one of the rarest gem mineral in the world. Only about 300 painite crystals have ever been found, and most of them are very small. The largest painite crystal ever found is only about 2.5 centimeters in length. Because of its rarity, painite is also one of the most expensive gem minerals in the world.
that is an absolutely beautiful gemstone, very thoroughly described in an informative but horribly SEO-riddled article... god I hate what the internet has become, give me an eccentric geologist's Angelfire page please