Sagenitic agate
Lapidary material SiO2
Also called Sagenite agate and Sagenite
About it
Agate that grew around sprays of needle-like crystals such as goethite, rutile, or zeolites. Nipomo, California, and Oregon are known sources.
- Type
- Lapidary material
- Group
- Agate (chalcedony)
- Formula
- SiO2
- Hardness (Mohs)
- 6.5–7
- Specific gravity
- 2.57–2.64
- Streak
- white
- Lustre
- waxy, vitreous (glassy)
- Crystal system
- Trigonal
- Colours
- clear or white with black, brown, gold, or red needle sprays
- Transparency
- translucent
- Cleavage and fracture
- none; conchoidal fracture
Typical values: real specimens vary. For more, see mindat.org.