Mineral Species: Tourmaline var. Dravite

Chemical Formula: NaMg3Al6(BO3)3Si6O18(OH)4

Chemical Name: Sodium Magnesium Borosilicate Hydroxide

Mineral Class: Cyclosilicate

Mineral Notes: Dravite is a relatively rare Tourmaline mineral found in metamorphosed limestones or mafic igneous rocks with metasomatically introduced boron. The mineral forms two series, one with Schorl, the other with Elbaite.   

Description: A nice, elongated, sharply-terminated Dravite crystal with excellent shiny yellow faces. Tha matrix is white Quartz, which provides a very good contrast for the Tourmaline. A lovely display specimen.

Location: Beura, Val d'Ossola, Piedmont, Italy.