Nuumite Tumblestone Nuumite is only mined in Nuuk in Greenland. It comprises of two minerals, Gedrite and Anthophyllite with a hardness of about 6. It is the worlds oldest mineral - 3 billion years old. Meausres approx. 2.7 cms. Check out my other items ! Be sure to add me to your favourites list !Please remember if you are making multiple purchases to request an invoice before you pay so I can reduce the postage/shipping costs for you.