Schorl, Microcline, Quartz, Albite
Civilian Conservation Corps Quarry, Haddam, Middlesex Co., Connecticut, USA
Large crystal of schorl in very coarse-grained quartz / feldspar (mostly microcline and perhaps albite, note two different textures of feldspars in the image, one altering more than the other). The green is assorted moss / lichen overgrowth. These crystals are higher on the wall and nearly impossible to remove without totally destroying them. ...
© 2012, JGW