Golden Scapolite Tumblestone Scapolite is a group of rock-forming silicate minerals composed of aluminium , calcium , and sodium silicate with chlorine , carbonate and sulphate . From Tanzania this gem quality tumblestone measures approx. 2.7 cms - a very rare tumblestone indeed. 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.