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 to 2 feet (60 cm) across have been found. Most typical are colorless to pale green or pink overgrowths on pale green cored ("reverse watermelon") crystals, usually less than 15 cm long. Commonly frozen in quartz and associated with fluorapatite, cleavelandite, elbaite. Pocket crystals rare.
Habit:
elongated hexagonal prisms, terminated with pinacoids and partial pyramids {11bar21}
Colour:
yellow, peach, pale green, pink overgrowths on pale green cores, aqua, colorless
Luminescent properties:
blue-white
Quality for species:
Excellent - world class for species or very significant. (!!)
Gillette Quarry, Haddam Neck, Haddam, Middlesex County, Connecticut, USA