Abstract
Ferroan-gahnite, (Zn,Fe)Al2O4, is a common accessory mineral found in association with the metamorphosed volcanogenic massive sulfide ore bodies of the Mineral District, Virginia. Gahnite is present throughout the mineralized zones that contain pyrite, sphalerite, chalcopyrite, and sulfosalts. Although constituting only 1–2 modal percent of most samples and displaying not well-defined distribution pattern, gahnite is especially abundant at the margins of the mineralized zones and locally constitutes as much as 35 modal percent. The compositions vary slightly from one deposit to another but all lie within the range of 68 to 88 mol.% gahnite (ZnAl2O4), 8 to 25 mol.% hercynite (FeAl2O4), and 1–17 mol.% spinel (MgAl2O4). Gahnite occurs within a wide variety of mineral assemblages, with or without coexisting sphalerite.
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