Figure F8. Former olivine blades, replaced by fine grained intergrowths of pyrite, chloritic clay, and minor anhydrite, in the spinifex-textured xenolith within altered dacite Sample 193-1188A-7R-2 (Piece 1, 17–21 cm; CSIRO 142652). Pseudomorphs of former radiating pyroxene platelets between the olivine blades, replaced by clay, are evident in the ordinary light view (A). Large euhedra of pyrite and anhedral, birefringent anhydrite, plus tiny equivalents, together with clay, have replaced the matrix. Width of view = 1.3 mm; (A) ordinary transmitted light, (B) transmitted light with crossed polarizers, (C) reflected light.

Figure F8. Former olivine blades, replaced by fine grained intergrowths of pyrite, chloritic clay, and minor anhydrite, in the spinifex-textured xenolith within altered dacite Sample 193-1188A-7R-2 (Piece 1, 17–21 cm; CSIRO 142652). Pseudomorphs of former radiating pyroxene platelets between the olivine blades, replaced by clay, are evident in the ordinary light view (A). Large euhedra of pyrite and anhedral, birefringent anhydrite, plus tiny equivalents, together with clay, have replaced the matrix. Width of view = 1.3 mm; (A) ordinary transmitted light, (B) transmitted light with crossed polarizers, (C) reflected light.