Sagenite n. : Acicular rutile occurring in reticulated forms imbedded in quartz.

Example:


Taxonomy
agate, inclusions, sagenite, plume, plume agate, sagenitic, moss agate, collector, Dendritic agate, colors, needles, Montana Agate, mineral, growths, dendrites, deposits, belief, percentage.

Defination from the web:
sagenite can be found at most agate fields. ... Those few agate fields that have a higher incidence of sagenite offer a rare and exciting treat to the collector. ... I have not yet seen plumes or sagenite needles penetrate bands in agate. ...