Silver Obsidian
Black volcanic glass with a silver sheen caught in its flow lines.
SPECIES
Volcanic glass
HARDNESS
5–5.5 Mohs
CALIBRES
4 · 6 mm
Black volcanic glass with a silver sheen caught in its flow lines.
SPECIES
Volcanic glass
HARDNESS
5–5.5 Mohs
CALIBRES
4 · 6 mm
