Tanzanite Crystal — Unheated

$1,163.17
Chemical FormulaCa₂Al₃(SiO₄)₃(OH)
Crystal SystemOrthorhombic
Mohs Hardness6.5
Specific Gravity3.35
LusterVitreous
TransparencyTransparent

Tanzanite — blue-purple zoisite — was discovered in 1967, reportedly by a Maasai herder who noticed blue stones scattered by a lightning-caused brush fire. The heat had converted b…

Only 2 available — a rare find.

SKU: TC-MIN-0266
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Description

Consider what had to happen for this specimen to exist. Tanzanite — blue-purple zoisite — was discovered in 1967, reportedly by a Maasai herder who noticed blue stones scattered by a lightning-caused brush fire. The heat had converted brown trichroic zoisite into the blue-purple we prize. An unheated natural crystal shows the raw trichroism: blue, purple, and burgundy shifting with viewing direction.

This specimen originates from Merelani Hills, Arusha, Tanzania, 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

Tanzanite Crystal — Unheated from Merelani Hills, Arusha, Tanzania. This locality is known for producing specimens of exceptional quality.

Collector Notes

Best displayed where natural light can play across the surfaces at different times of day.