Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
Schooner (1955): a thin grayish coating on galena which had been exposed to much weathering on the oldest of the Strickland Quarry dumps. The matrix, in his one good specimen, is a mixture of secondary albite and gray lepidolite.
Habit:
coating
Colour:
gray
Quality for species:
Poor for species, only of interest for locality collectors. (#)