Figure F15. Isolated and coalesced microspherulites forming necklacelike aggregates (arrows) are dispersed in a silica-clay-rich groundmass. Because of the alteration, most microspherulites lack any internal structures (interval 193-1188A-8R-1 [Piece 8, 66-69 cm], Unit 6, in plane-polarized light; width of view = 1.40 mm. Photomicrograph ID# 1188A

Figure F15. Isolated and coalesced microspherulites forming necklacelike aggregates (arrows) are dispersed in a silica-clay-rich groundmass. Because of the alteration, most microspherulites lack any internal structures (interval 193-1188A-8R-1 [Piece 8, 66-69 cm], Unit 6, in plane-polarized light; width of view = 1.40 mm. Photomicrograph ID# 1188A_33; thin section 7).