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
Inclusions: Almost no inclusions. Just solid, flat black backing material.
Cost per Gram: $0.04
Size approximately 1 pc: 10mm x 7mm x 8mm
Weight approximately 1 pc: 500g
Rough is rough. We do our best to grade and describe pieces in the lot, but ultimately, they all differ.