sagenite

[ saj-uh-nahyt ]
/ ˈsædʒ əˌnaɪt /

noun

a variety of rutile occurring as needlelike crystals embedded in quartz.
Compare Venus hairstone.

Origin of sagenite

1795–1805; < French sagénite < Greek sagḗn(ē) net (cf. seine) + French -ite -ite1