was identified in a second deposit, a dolomite-rich assemblage in the Pilbara region of Western Australia. Within the assemblage included a homogeneous fine-grained layer of malachite, quartz, and goethite along with heterogeneous grouping of dark nodules and masses in a malachite-quartz matrix. A group of selenides were found in these masses and include berzelianite Cu2Se, umangite Cu3S2, naumannite Ag2Se, oosterboschite (Pd, Cu)7Se5, luberoite Pt5Se4, chrisstanleyite, and, at the time, the unknown jagueite (Nickel 2002; Paar et al. 2004). Native silver, gold, unidentified palladium and platinum oxides, and several other minerals were identified as well. A similar ore deposit was found in Northern Australia and had had microthermometry and low-temperature laser Raman spectroscopy utilized in this assemblage. The results showed the minerals came from an acidic, high saline hydrothermal solution at temperatures of 140 °C. The interaction of hydrothermal fluids with feldspathic rocks precipitated the ore minerals (Nickel 2002). A third deposit of chrisstanleyite was found in El Chire, La Rioja, Argentina in a cutting calcite vein containing only one selenide-bearing vein through a hematite-rich sandstone and arkose host rocks. These rocks, similar to those from the Pilbara Region in Australia, were hydrothermally altered. The selenide vein included similar minerals tiemannite HgSe, naumannite, clausthalite, umangite, klockmannite, chrisstanleyite, and jagueite. It was identified that the grains of chrisstanleyite were surrounded by a rim of unnamed platinum-group metals, which were too thin to extract for identification, though it is associated with a silvery-mercury alloy. This allowed determination of crystallization for the selenide assemblage: chrisstanleyite and jagueite → (clausthalite) → naumannite and tiemannite → umangite and klockmannite → Pd-free native gold (Paar et al. 2004). Structure The crystal structure for chrisstanleyite has two different polyhedra structures that intersect and support each other, which is the same as jagueite. An AgSe4 (or CuSe4) tetrahedral creates a grooved (100) layer that are grouped in dimers of Ag2Se6, which share four vertices with adjacent dimers. Oriented alternatively above and below the layer are the two remaining vertices for each tetrahedron, resulting in the corrugation of the silver-based layer as well the sharing of Se atoms with Pd polyhedra (Topa et al. 2006). The second framework consists of single coordination squares of Pd1 and paired Pd2 polyhedra, which create a zig-zag composition. These Pd2 polyhedra are layered at an angle (010) and interconnected by the Pd1 squares. This then creates the c glide planes that cause the zig-zag