Discussion
Dravite is a :
Answer: B
Dravite is Mg-tourmaline.
The tourmaline group is named by the cations in its Y site. Dravite is the sodium-magnesium tourmaline, NaMg3Al6(BO3)3Si6O18(OH)4, typically brown and common in metamorphosed sediments and carbonates.
The iron-rich tourmaline (option C) is schorl, the common black variety, and the lithium tourmaline is elbaite. Dravite is not a pyroxene, so the Ca-pyroxene and Mg-augite options are wrong.
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