Nuumite, aka nuumit and nuummite comes only from Greenland and is one of the oldest rocks of the earth!
Nuummite is a gemstone formed from a mixture of two minerals from the orthoamphibole group: anthophyllite and gedrite. The name nuummite is derived from the Municipality of Nuuk, where the stone was discovered in 1982. It has since been found in several localities in the outer part of the Godthabsfjord near Nuuk. Geologically speaking, nuummite is of volcanic origin and was formed about 3 billion years ago. Subsequent influences on the rock (metamorphism) have given rise to the striking mixture of crystals which gives it it's iridescent, sparkly, unique appearance.
All the stones I have listed are some of the best quality.