Scottish agate
Lapidary material SiO2
Also called Scotch pebble
About it
Agate from ancient lavas in Scotland, notably Angus, Fife, and Ayrshire, collected since Victorian times and set in Scottish pebble jewellery. Many have very fine, tight bands.
- 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, pink, white, grey, blue
- Transparency
- translucent, opaque
- Cleavage and fracture
- none; conchoidal fracture
Typical values: real specimens vary. For more, see mindat.org.