Pair of connected spheres of Pyrite with attached Calcite crystals. The smaller sphere has one area broken revealing an inner core of Chalcopyrite, which likely comprised the interior of the other sphere as well. From an old Pyrite collection built in the 1970s-80s.

Highly lustrous crystals of Pyrite with clear Quartz crystals. From an old Pyrite collection built in the 1970s-80s.

Specimen of solid Pyrite with good Pyrite crystals to 2.2cm. These old iron mines were first worked in 1717 and eventually closed in 1928. Bright and shiny cubic crystals all over. From an old Pyrite collection built in the 1970s-80s.

Specimen of solid Pyrite with small satiny crystals covering the entire surface. Crystallized all around. From an old Pyrite collection built in the 1970s-80s.

Calcite and Talc with Pyrite crystals to 1.2cm in size. Comes wtih 2 old labels. From an old Pyrite collection built in the 1970s-80s.

Needles of acicular Pyrite crystals in a transparent cleavage rhomb of Calcite. From an old Pyrite collection built in the 1970s-80s.

Fossil Ammonite covered with Pyrite crystals. These are not the tiny, granular Pyrite typically seen with fossils - tey are big crystals to 1cm. From an old Pyrite collection built in the 1970s-80s.

Three interconnected nodular masses of Pyrite crystals over Marcasite. A floater, crystallized on all sides and undamaged. From an old Pyrite collection built in the 1970s-80s.

Crystallied Pyrite and Marcasite with white scalenohedral Calcite crystals. From an old Pyrite collection built in the 1970s-80s.

Classic Pyrite 'bar' from the famous Buick Mine in the Viburnum Trend of Missouri. Good ones like this came out decades ago and are now desireable and hard to find. From an old Pyrite collection built in the 1970s-80s.

Cluster of cubic Pyrite crystals from the Carson Hill Gold Mine. The Pyrite crystals are Gold bearing. According to articles on the deposit 'The ore bodies at this mine were formed by extensive hydrothermal alteration and mineralization of fractured metavolcanic and metasedimentary rocks within the shear zones of two principal quartz veins; the Bull vein and Calaveras vein. Unlike typical gold deposits in this area, these quartz veins were unusually low-grade to barren, with the bulk of the gold coming from disseminated sulfides in the altered wall rocks. Locally, greenstone bodies adjacent to the quartz veins contain enough disseminated auriferous pyrite in large enough bodies to constitute what has been called 'gray ore'. Assays of solitary large pyrite crystals averaged greater than 0.333 ounces per ton'. From an old Pyrite collection built in the 1970s-80s.