“…Likewise, very little is known about the local structural environment of Fe 2+ in quartz (Gressey et al, 1993;Schofield et al, 1995;Di Benedetto et al, 2009), because the magnetic properties of Fe 2+ with oxygen neighbours preclude its EPR observation at conventional Xband frequencies (Weil, 1994). S1; Bershov, 1970;Isoya and Weil, 1979;Weil, 1984;Bailey et al, 1992;Bailey and Weil, 1992a,b). This S1; Wright et al, 1963;Rinneberg and Weil, 1972;Weil, 1984;Matyash et al, 1987;Isoya et al, 1988;Weil, 1991, 1992).…”