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gahnite

   Also found in: Encyclopedia, Wikipedia 0.04 sec.
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).
These anomalies are characterized by sulphide paragneiss with variable amounts of accessory pyrrhotite +/- magnetite +/- garnet +/- biotite +/- gahnite.
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).
 
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