Dryhead agate
Lapidary material SiO2
About it
Red-orange and white fortification agate weathered from limestone in the Pryor Mountains and Bighorn Canyon area of south-central Montana. Hard to find and highly collected.
- 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
- red, orange, white, tan
- Transparency
- translucent, opaque
- Cleavage and fracture
- none; conchoidal fracture
Typical values: real specimens vary. For more, see mindat.org.