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gahnite
[gah-nahyt]
noun
a dark-green to black mineral of the spinel group, zinc aluminate, ZnAl 2 O 4 .
gahnite
/ ˈɡɑːԲɪ /
noun
a dark green mineral of the spinel group consisting of zinc aluminium oxide. Formula: ZnAl 2 O 4
Word History and Origins
Word History and Origins
Origin of gahnite1
Example Sentences
Spinel, spin′el, or spi-nel′, n. a mineral composed chiefly of magnesia and alumina, and crystallising in octahedra—ruby, or magnesia spinel, reddish; pleonaste, dark green to black; picotite, or chrome spinel, black; gahnite, or zinc spinel, green to brown; hercynite, or iron spinel, black.
Associated with franklinite at Franklin Furnace, and found also at some other localities, is another member of the spinel group, namely, gahnite or zinc-spinel, which is a zinc aluminate, ZnAl2O4, with a little of the zinc replaced by iron and manganese.
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