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!
From an old trial on the Low Pike vein [NY320358]. Identified by infra-red spectrophotometry at the University of Manchester Institute of Science and Technology (UMIST).
Habit:
thin crusts on quartz; pseudomorphs after mimetite with cornwallite, beudantite etc.
Low Pike north slopes, Caldbeck, Allerdale, Cumbria, England, UK