Date Collected: 20th August 2020
Station ID: CCU-024
Datum: NAD83 Zone 11
Description: Vesicular basalt of the Nicol Creek Formation. Most vesicles are infilled with iron oxides, possibly suggesting presence of sulphide originally. Surface of the rock is highly oxidized but has little penetration. The sample is run through with mm to sub-mm quartz veins, some cutting at low angles and suggesting more than one phase. Some of the larger veins have areas of deep red – purple iron oxide formation, although it is patchy and not continuous along the vein. These also have inclusions of fine, blebby magnetite. Larger (up to 8mm) cubes of mineral exist. Could be a replacement of pyrite: mineral is black and lustrous, resembling galena or sphalerite, but seems harder. These cubes are common, especially along quartz-filled fracture surfaces.