Figure F36. Photomicrographs showing the morphology of olivine phenocrysts and Cr spinel inclusions (plane-polarized light; field of view = 5 mm). A. Olivines with an alteration rim of iddingsite but with unaltered centers in Unit 6. Opaque Cr spinel inclusions are present in the phenocryst at the center of the photomicrograph (Sample 197-1206A-18R-1 [Piece 4, 49-51 cm]) (photomicrograph 1206A-328). B. Olivine phenocrysts with an alteration rim of serpentine but with unaltered centers in Unit 17. Discrete, round, relict Cr spinel phenocrysts are also present (Sample 197-1206A-38R-1 [Piece 2B, 55-58 cm]) (photomicrograph 1206A-384).

Figure F36. Photomicrographs showing the morphology of olivine phenocrysts and Cr spinel inclusions (plane-polarized light; field of view = 5 mm). A. Olivines with an alteration rim of iddingsite but with unaltered centers in Unit 6. Opaque Cr spinel inclusions are present in the phenocryst at the center of the photomicrograph (Sample 197-1206A-18R-1 [Piece 4, 49-51 cm]) (photomicrograph 1206A-328). B. Olivine phenocrysts with an alteration rim of serpentine but with unaltered centers in Unit 17. Discrete, round, relict Cr spinel phenocrysts are also present (Sample 197-1206A-38R-1 [Piece 2B, 55-58 cm]) (photomicrograph 1206A-384).