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!
Crystals up to 30mm occur on an iron-stained muscovite and quartz matrix and appear to have been most common on the selvedges of the veins (Fortey, 1978).
Habit:
prisms
Colour:
greenish; colourless; yellow; blue; pink
Luminescent properties:
green crystals fluoresce orange-yellow in shortwave UV (Cooper & Stanley, 1990)
Carrock Mine, Mungrisdale, Eden, Cumbria, England, UK