This Specimen has been sold.
1.7" Brown Dravite Tourmaline Crystal - Western Australia
This is a beautiful double-terminated, brown dravite tourmaline crystal cluster that's associated with small amounts of mica, indicated by the lustrous, plate-like crystal formations found within the cavity along one face of the dravite crystal. This crystal was collected from the Upper Gascoyne River of Western Australia.
Dravite, also known as "brown tourmaline," is composed of sodium, magnesium, aluminum, and boro-silicate, with the chemical formula of NaMg3Al6(BO3)3Si6O18(OH)3F. Dravite is a subclass of tourmaline, which along with schorl tourmaline and uvite (also subclasses of tourmaline), form into a prismatic/columnar formation.