Large, relatively flat specimen with the front face covered by crystals of Galena that have replaced Bournonite. Individual crystal reach 1.2cm in size and are undamaged.

Rare pseudomorph of Orthoclase after Quartz. Orthoclase hosting the 3cm pseudomorph at one end, mostly the termination of the former Quartz crystal. Collected in the 1970s, this is one of only a small number of specimens known.

Large intergrown Enstatite crystals that have been replaced by green Talc. Complete all around and terminated. These were found in approximately 1900-1910 and this is considered a large specimen. Comes with an old German label.

Classic old specimen of translucent blue Chalcedony that has repalced cubic Fluorite. Lustrous undamaged crystals. Comes with an old Julius Bohm label.

Rare association of Malachite after Azurite crystals atop green Smithsonite. There is also an etched crystal of Azurite present. Old Scalisi label indicates it was from Harvard (1965) and the Dr. Ian Hunter collection prior to Acosta.