Gahnite definitions

gä'nīt'
A brittle, dark green to brown or black mineral, ZnAl2 O4 .
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A dark green to black, very hard, brittle, crystalline mineral, ZnAl2O4, found in schists, pegmatites, etc.; zinc spinel.
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(mineralogy) A rare mineral ZnAl2O4 in the spinel group.
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Origin of gahnite

After Johan Gahn (1745–1818), Swedish mineralogist