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!
Meikle (1989): "Albite occurs as reddish-brown trapezohedral crystals less than 10 mm in size, and as crystal groups pseudomorphing analcime. The crystals are a composite of clear albite with contained brown or reddish-brown earthy volcanic ash. In small cavities clear, transparent crystals of albite occur as random individual plates <0.1 x 0.8 mm with a square termination, or as doubly-terminated tapering coffin-shaped crystals <0.1 x 1 mm. In addition, small cavities in altered lava contain small radial groupings of clear, transparent albite crystals <0.1 x 0.5 mm, with single, tapering terminations."
