Ferroan gahnite, with compositions ranging from gahnite60-hercynitej30-Mg spinel10 to hercynite49-gahnitess-Mg spinel13 have been found in quartz-biotite-almandine metasedimentary rocks from the Double Lake area of the Wind River mountains of Wyoming. It is believed that the large amount of zinc in these spinels, which seems to have been provided by desulfurization of nearby ore minerals, stabilized them in the presence of quartz.

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