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!
"Water-clear crystals of chabazite, up to 3 or 4 mm across occur sporadically in some cavities in the basalt, seated directly on the clay film, or where this is absent, on the andersine-augite-ilmenite crystals. The chabazite crystals are generally lenticular with a hexagonal outline, a form commonly given the variety term phacolite."
Portland Harbour Trust Quarry, Cape Sir William Grant, Portland, Glenelg Shire, Victoria, Australia