Dravite is a silicate with composition NaMg3Al6(BO3)3(Si6O18)(OH)4. Dravite is a member of the tourmaline family. This sample of dravite, displayed in the Smithsonian Museum of Natural History, originated in Franklin, New Jersey. The sample is 12 cm across.
This dravite sample is 2-3cm across and originated in Yinnietharra, Western Australia.