Feldspar is mined from rather large granite bodies (called plutons by geologists), from pegamatites (formed when the last fluid stages of a cystalizing granite becomes concentrated in small liquid and vapor-rich pockets that allow the growth of extememly large cyrstals), and from sands composed mostly of feldspar. Feldspars are relatively hard at 6 on Mohs hardness scale. Feldspars are generally light-colored, including white, pink, tan, green, or gray. The color varies due to impurities within the cyrstal structure. Feldspar is the mineral that gives granite its pink, green or gray color. When feldspar weathers from igneous or metamorphic rocks, it can acculmulate as sand. It is, however, easily weathered, and eventaully will break down into clay.
$25.00
2 (lbs)
4x2x6 (inch)