• (a.) Resembling sagenite; -- applied to quartz when containing acicular crystals of other minerals, most commonly rutile, also tourmaline, actinolite, and the like.
Sag`e·nit'ic adjective (Min.) Resembling sagenite; -- applied to quartz when containing acicular crystals of other minerals, most commonly rutile, also tourmaline, actinolite, and the like.