Still in dense, partially altered basalt, typically with blue-green clay in vesicles and fractures. Starting to get more variety in secondary minerals -- including zeolites (photo of puffy, fibrous white mineral) and quartz (greyish fill in center of some vugs). Many vugs (vesicles?) have a thin rim of calcite (white) with quartz fill. The occurrence of zeolite and quartz suggests elevated temperatures, higher than those experienced higher in hole. BHT on Wednesday 8 Dec was 41.65 C at 1394 m --- not an equilibrium temperature, T was still going up when drilling started. Depth as of wednesday night was 1403 meters.