A black base coloured material with fine red webbing. Fairly hard stone but can fracture easily usually along a web so can be tricky to work some styles of jewellery from it.

Hardness- 6-6.5 Mohs scales

Stone Variety- Chalcedony / Quartz

Country of Origin- US

Suitable for - size limits apply:

• Plugs
• Labrets
• Inlay