From Greg Dainty: This piece was collected, and labeled, by Norman Robinson, from an old exploration trench. Its hard to figure out exactly whats going on here, there is what appears to be chrysocolla replacing malachite, some malachite, some non replacement chrysocolla, as for the yellowish white mineral on the tops I have no idea (possibly a weathered pyromorphite). Then when I looked at it under magnification, I found a single bladed wulfenite, and in another vug, a group of transparent clear crystals, which also have no idea, what they are. Interesting. 43x28x28mm.
Most Mineral Species
Albite Amethyst Analcime Anatase Anglesite Aragonite Arsenopyrite Azurite Barite Brochantite Calcite Cassiterite Cerussite Chabazite Chalcopyrite Copper Crocoite Cuprite Dolomite Fluorite Galena Goethite Gold Gypsum Hematite Hemimorphite Libethenite Magnetite Malachite Mimetite Natrolite Phillipsite Pyrite Pyromorphite Quartz Siderite Silver Smithsonite Smoky Quartz Sphalerite Stibnite Thomsonite Unidentified Species Wavellite Wulfenite