Stone Archive

Black Obsidian

Provenance

Brazil

Concept

Brutalist Glass

TRACE & NARRATIVE

When lava meets water and cools too rapidly to crystallise, the result is this natural glass. Mineralogically, it is not a stone—classified as an amorphous solid.

The Aztecs fashioned obsidian into blades and mirrors. Fractured, it breaks conchoidally, producing an edge thinner than a steel scalpel. Some surgical blades still use obsidian today.

In Japan, obsidian has been in use since the Jōmon period, with Shirataki in Hokkaido and Kirigamine in Nagano as key sources. Trace the trade routes of the Stone Age, and they map onto the distribution of obsidian. One stone, outlining an ancient network.

PHYSICAL ATTRIBUTES

MOHS SCALE

MOHS 5.5 ｜ GLASSY STRUCTURE

LATTICE STRUCTURE

AMORPHOUS STATE | FLUID SOLID

VISUAL METRICS

Absorbs light rather than returning it. Jet black, no variation. On the wearer, it has the effect of sharpening the surrounding lines by a fraction.

MAINTENANCE

Volcanic glass — chips and fractures on impact.
Avoid drops onto hard surfaces.
Handle more carefully than its appearance suggests.

SYMBOLIC INDEX

ORIENTAL PHASE

WATER PHASE, FIRE PHASE

CLASSICAL ELEMENT

TERRA (Earth), IGNIS (Fire)

PHYSIOLOGICAL FOCUS

Root | Muladhara

ASTROLOGICAL PERIOD

Scorpio, Sagittarius, Capricorn

PSYCHOLOGICAL PROJECTION

Severance — Exposure — Confrontation

Cuts clean. Ambiguity doesn't survive contact. It will show you what you'd rather not see — your own weak points, rendered in high contrast. Not a gentle material. Wear it with intent.

SELECTOR'S NOTE

Sunday evening. He opens next week's calendar and asks himself which of these commitments actually need to exist. Not everyone audits their own schedule with that precision. Ambiguity left unresolved makes him uncomfortable — not about others, about himself. This stone works well in that hand. The rigour is internal. It always was.