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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
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spodumene
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hiddenite
hiddenite Crystal of hiddenite.

hiddenite

mineral
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History

hiddenite, green, semiprecious variety of the silicate mineral spodumene (q.v.).

This article was most recently revised and updated by Amy Tikkanen.