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dravite
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Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.
(Bed) Rocks and (Flint) Stones
Quick Facts
Related Topics:
gemstone
tourmaline
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dravite

mineral
Also known as: magnesium tourmaline
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Britannica Editors
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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History

dravite, a brown, magnesium-rich variety of tourmaline. See tourmaline.