Brown Dravite Tourmaline Crystals in Mica - Western Australia

This is a beautiful brown dravite tourmaline crystal cluster that's still partially embedded in the mica (muscovite) formation from which it was found. This specimen was collected from the Upper Gascoyne River of Western Australia. Comes with an acrylic display stand.

Muscovite is a phyllosilicate mineral of aluminium and potassium. It has a highly perfect basal cleavage yielding remarkably thin laminae which are often highly elastic.

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.

This prismatic structure can be seen on this dravite specimen, where one side shows its prismatic shape, and the other rough side shows where it grew against another mineral.
Tourmaline var. Dravite & Mica (Muscovite)
Yinnietharra Station, Upper Gascoyne River, Western Australia
Entire specimen 2.6"x1.4", largest dravite crystal 1.09" long