Pure, coarsely crystalline quartzite is common among strata of the Precambrian-Paleozoic(?) Monashee Complex. These rocks are free from iron-bearing minerals, appear translucent white in hand specimen, and are so homogeneous as to be almost devoid of internal bedding or lamination. Such quartzite may be a potential source of silica for industrial uses where a high degree of purity is demanded. Relatively pure quartzites occur on a ridge west of Upper Arrow Lake, 1.5 kilometres east of Coursier Lake and north of Pingston Creek.