Figure F6. Contact between jasperoid and a wallrock fragment in Sample 193-1189A-7R-1 (Piece 17, 99–102 cm; CSIRO 142697) marked by a selvage of quartz lacking hematite cores. Large pyrite cubes occur in both jasperoid and wallrock. The wallrock contains corroded phenocrysts of unaltered plagioclase and numerous plagioclase microlites set in clay. Tiny crystals of probable apatite occur in the upper part of the selvage; these are rare overall in the sample. Width of field = 1.3 mm. A. Ordinary light. B. Crossed polarizers.

Figure F6. Contact between jasperoid and a wallrock fragment in Sample 193-1189A-7R-1 (Piece 17, 99–102 cm; CSIRO 142697) marked by a selvage of quartz lacking hematite cores. Large pyrite cubes occur in both jasperoid and wallrock. The wallrock contains corroded phenocrysts of unaltered plagioclase and numerous plagioclase microlites set in clay. Tiny crystals of probable apatite occur in the upper part of the selvage; these are rare overall in the sample. Width of field = 1.3 mm. A. Ordinary light. B. Crossed polarizers.