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The Collaborative International Dictionary
gahnite

gahnite \gahn"ite\ (g[aum]n"[imac]t), n. [Named after Gahn, a Swedish chemist.] (Min.) Zinc spinel; automolite.

Wiktionary
gahnite

n. (context mineral English) A rare mineral zincaluminum2oxygen4 in the spinel group.

Wikipedia
Gahnite

Gahnite, ZnAlO, is a rare mineral belonging to the spinel group. It forms octahedral crystals which may be green, blue, yellow, brown or grey. It often forms as an alteration product of sphalerite in altered massive sulphide deposits such as at Broken Hill, Australia. Other occurrences include Falun, Sweden where it is found in pegmatites and skarns, Charlemont, Massachusetts; Spruce Pine, North Carolina; White Picacho district, Arizona; Topsham, Maine; and Franklin, New Jersey in the United States.

It was first described in 1807 for an occurrence in the Falu mine, Falun, Dalarna, Sweden, and named after the Swedish chemist, Johan Gottlieb Gahn (1745–1818), the discoverer of the element manganese. It is sometimes called zinc spinel.

It is sometimes used as a gemstone.