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!
Primary crystallization as typically massive and skeletal segregations mixed with almandine, dark brown mica, and columbite-(Fe) in a cleavelandite matrix. Tons of it were removed during the activity in 1953. But more interesting as a secondary crystallization characterized by clear, white, lavender to pale blue, tabular to short, euhedral micro-crystals (mostly <<1") in pockets with K-rich albite, elbaite, fluorite, pyrite, calcite, micas, etc.
Strickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA