Origin: Fraser River, British Columbia, Canada

Description: This is plain and simple black basalt. when slabbed, it serves as backing material for lamination. Most commonly used for opals, but it can add structure to any other kind of stone as well as an alternative to Opticon stabilization.

Chemical Composition: SiO₂Al₂O₃

Grade: Lapidary Grade
Appearance: Opaque
Inclusions: Almost no inclusions. Just solid, flat black backing material.

Approximate Size of 1 pc: 10mm x 7mm x 8mm
Approximate Weight of 1 pc: 500g

Rough is rough. We do our best to grade and describe pieces in the lot, but ultimately, they all differ.