USA125 - Goethite after Siderite on Microcline - Mona Mine, Sentinel Rock, Pikes Peak, El Paso Co., Colorado, USA

A cluster of sharp pseudomorphs of goethite after siderite on microcline. The replacement appears to be complete, as fissures in the crystals show a rust-red color. The largest rhomb (in photo 3) is 3.7 cm across. Some minor quartz is also present. This is a fine cabinet specimen for the locality and displays well. Mined by Adam Sotomayor in 2009. 9.7 x 8.4 x 6.2 cm.