Sagenite
Sagenite may refer to any of the following types of minerals with an acicular crystal habit. It is not a valid mineral species.
- A twinned, reticulated variety of rutile originally described in 1796 by Horace [Bénédict de Saussure].
- Rutilated quartz, a variety of quartz with acicular inclusions of often golden-yellow rutile, first called sagenite by George Kunz in 1892.
- Sagenitic agate, a type of agate with acicular inclusions of another mineral such as anhydrite, aragonite, goethite, rutile, or a zeolite.
- Any other variety of quartz or chalcedony with acicular inclusions of another mineral.