Cavansite : Ca(V 4+ O)Si 4 O 10 · 4 H 2 O: Cavansite on Heulandite, Wagholi quarry near Pune, India. Size of the Cavansite ball in the middle of the picutre approx. cm. This locality is co type locality of Cavansite and is currently the world's best locality for this minerals (on quality as well as on quantity).