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!
"At the northern end of the Trentham Falls quarry, chabazite crystals form pseudocubic rhombohedrons up to 4 mm across lining the walls of cavities. Associated minerals include phillipsite, sprays of acicular aragonite and scalenohedrons of calcite. The minerals have crystallized in vughs which are coated with an orange or greenish clay, possibly montmorillonite."
