Auction Name: 2026 January 24 Minerals Showcase Auction

Lot Number: 48029

Shortcut to Lot: HA.com/29183*48029

Colemanite
Bigadiç Mine, Bigadiç District, Balikesir Province, Turkey
20.7 x 15.7 x 7.1 cm (8.15 x 6.18 x 2.80 in)

A substantial cluster of Colemanite crystals, reaching up to 5.4 centimeters across, each displaying a sharply defined, highly modified short-prismatic habit. The crystals are transparent to translucent, with interiors showing a colorless to soft yellow hue, while the smooth external faces have a gentle glass-like sheen. Under shortwave UV light, the Colemanite softly fluoresces a blue-white hue.

From the collection of Daniel "Dan" R. Kennedy.

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