Agate Slice — Fortification Pattern

$33.17
Chemical FormulaSiO₂
Crystal SystemTrigonal
Mohs Hardness6.5–7
Specific Gravity2.60
LusterWaxy
TransparencyTranslucent

Botswana agate forms in volcanic amygdales — gas bubbles in ancient lava flows — over millions of years as chalcedony layers deposit concentrically. The fortification pattern maps …

46 in stock

SKU: TC-MIN-0132
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Description

Every mineral is a story of chemistry, pressure, and patience. Botswana agate forms in volcanic amygdales — gas bubbles in ancient lava flows — over millions of years as chalcedony layers deposit concentrically. The fortification pattern maps each episode of deposition: a geological autobiography in concentric arcs.

This specimen originates from Botswana, Africa, one of the world’s most significant localities for this type of material. Collectors and scientists have drawn from this region for generations, and for good reason: the combination of geological conditions here produces specimens of exceptional quality and clarity.

Every specimen is unique. Photographs approximate the visual experience, but the real thing — its weight, its luster under a raking light, the way it catches the corner of your eye — can only be experienced directly.

Formation

This specimen formed through geological processes operating over timescales that dwarf human history. The specific combination of chemistry, temperature, pressure, and time at this locality produced material of exceptional quality that makes it a valued addition to any serious collection.

Locality

Agate Slice — Fortification Pattern from Botswana, Africa. This locality is known for producing specimens of exceptional quality.

Collector Notes

The luster is maximized by low-angle raking light — try a single spotlight.