Brecciated jasper
Lapidary material SiO2
About it
Red jasper shattered into angular pieces and recemented by later quartz or chalcedony, giving a crazed mosaic. A common tumbling and bead material.
- Type
- Lapidary material
- Group
- Jasper (quartz)
- Formula
- SiO2
- Hardness (Mohs)
- 6.5–7
- Specific gravity
- 2.58–2.91
- Streak
- white
- Lustre
- vitreous (glassy), dull
- Crystal system
- Trigonal
- Colours
- red, brown, with cream or grey veins
- Transparency
- opaque
- Cleavage and fracture
- none; conchoidal to splintery fracture
Typical values: real specimens vary. For more, see mindat.org.