Sagenite

Sagenite may refer to any of the following types of minerals with an acicular (needle-shaped) crystal habit. It is not a valid mineral species.^[1]

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.^[2]^[3]
Any other variety of quartz or chalcedony with acicular inclusions of another mineral.

Rutile sagenite from Brazil
Rutilated quartz sagenite
Sagenitic agate from the Oregon coast

References

^ "Sagenite". mindat.org. Hudson Institute of Mineralogy. Retrieved 7 November 2025.
^ Lynch, Dan R.; Lynch, Bob (2012). Lake Superior Agates Field Guide. Adventure Publications. pp. 102–105. ISBN 978-1-59193-282-6.
^ Pabian, Roger; Jackson, Brian; Tandy, Peter; Cromartie, John (2016). Agates: Treasures of the Earth. Firefly Books. p. 34. ISBN 978-1-77085-644-8.

This set index article includes a list of related items that share the same name (or similar names).
If an internal link incorrectly led you here, you may wish to change the link to point directly to the intended article.

[1] "Sagenite". mindat.org. Hudson Institute of Mineralogy. Retrieved 7 November 2025.

[2] Lynch, Dan R.; Lynch, Bob (2012). Lake Superior Agates Field Guide. Adventure Publications. pp. 102–105. ISBN 978-1-59193-282-6.

[3] Pabian, Roger; Jackson, Brian; Tandy, Peter; Cromartie, John (2016). Agates: Treasures of the Earth. Firefly Books. p. 34. ISBN 978-1-77085-644-8.

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