Guilleminite, Malachite, Goethite

Excellent large, rich, well-crystallized specimen of vivid canary-yellow guilleminite with green malachite and dark brown goethite – note fibrous botryoids lining void – on altered, siliceous dolostone matrix from the famous Musonoi mine in the DR Congo. Eric Quinter specimen U/Th 0188, pictured on mindat.org. Rare!