Formula: ZnAl₂O₄

Species:

Colour: Dark blue-green, yellow, brown, black

Lustre: Vitreous

Hardness: 7½ – 8

Specific Gravity: 4.62 (Calculated)

Crystal System: Isometric

Member of: Spinel Subgroup > Oxyspinel Group > Spinel Supergroup; Gahnite-Hercynite Series, and the Gahnite-Spinel Series.

Name: Named in 1807 by Baron Karl Marie Ehrenbert von Moll in honor of Swedish chemist and mineralogist, Johan Gottlieb Gahn (1745–1818). The new name replaced automalite named by Anders Gustav Ekeberg.

Type Locality: Falun mine, Falun, Dalarna County – Sweden