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gahnite

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gahn·ite  (gänt)
n.
A dark green to brown or black mineral, ZnAl2O4. Also called zinc spinel.

[After Johan Gottlieb Gahn (1745-1818), Swedish mineralogist.]

gahnite [ˈgɑːnaɪt]
n
(Earth Sciences / Minerals) a dark green mineral of the spinel group consisting of zinc aluminium oxide. Formula: ZnAl2O4
[named after J. G. Gahn (1745-1818), Swedish chemist; see -ite1]


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Aluminum bronze results in alumina deposits, silicon bronze in silica deposits and trace aluminum in brass results in the complex gahnite (zinc alumina spinel).
A combination of well-characterized minerals and synthetic materials were used to calibrate for EPMA, including SMS scapolite (S and Cl), Corning W glass (6) (Co), SMS gahnite (Zn), SMS cassiterite (Sn), SMS strontianite and Corning X glass (Sr).
These anomalies are characterized by sulphide paragneiss with variable amounts of accessory pyrrhotite +/- magnetite +/- garnet +/- biotite +/- gahnite.
 
 
 
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