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!
Black to dark grey veins in the county rock, some times forming botryoidal masses and stalactitic forms. Common as thin veinlets in the micasious country rock.
Kennisham Hill Mine, Luxborough, Somerset West and Taunton, Somerset, England, UK