Obsidian forms in seconds. Lava meets water, pressure drops, and volcanic glass is born — sharper than any blade, colder than any stone.
Harder than steel by volume. Obsidian blades have been measured at 3 nanometres edge thickness — 500x sharper than surgical steel.
Breaks in smooth curved shells — the same fracture pattern that made it the preferred blade material for 10,000 years of human history.
High silica concentration prevents crystal formation during rapid cooling. The result is pure amorphous glass from the earth's core.
Formed at the exact thermal boundary where lava transforms from fluid to solid in under 10 seconds. No time for crystals. Only glass remains. The speed of formation determines everything — slow cooling makes granite; rapid cooling makes obsidian.
Rainbow obsidian and sheen obsidian exhibit iridescent reflectivity caused by nanoscale gas bubble layers trapped during formation. Each piece is unique — a frozen moment of geological event.
Only high-silica rhyolitic lava produces true obsidian. Basaltic lava cools too slowly. The chemistry must be exact — then the cooling must be near-instantaneous. Geology rarely cooperates. That's why obsidian is rare.
Every specimen is extracted by hand from active and dormant volcanic fields in Oregon, Mexico, Armenia, and Iceland. No blasting. No machinery. The stone breaks where it wants to break.
Grade A: absolute optical clarity, no inclusions. Grade B: minor flow lines, acceptable for tools. Grade C: decorative quality, visible inclusions, prized for pattern. Each grade serves a purpose.
Specimens ship in acid-free archival cases, individually padded. Every piece ships with a provenance certificate listing the exact field of origin, extraction date, and grader's initials.