Figure 24--Siderite rhombs (S) rimming walls of pores, some of which contain clay minerals. Framework grains of quartz (FQ) and plagioclase (PG), with clay from alteration, show corrugated-like edges along pores. Sotong 5G-5.1, 2188.1 m msl. Plane light. Scale bar = 0.10 mm.