Quartz and Pyrite

Sample of numerous, short thin prismatic euhedral Quartz crystals that are terminated by double rhombohedrons. The Quartz crystal have a greasy lustre and are embedded on a subhedral octahedral Pyrite that is brass-yellow and has parallel striations on one face. Faint crosswise striations are visible on the Quartz crystals. Largest Quartz crystal size: 1.9 cm x 0.5 cm x 0.5 cm. Quartz (SiO2) can come in a variety of colours from white to purple. Lustre is greasy or vitreous and streak is white. Hardness is 7. Quartz usually occurs as long or short prismatic crystals that are terminated by double rhombohedrons and have striations crosswise. Quartz can also be granular, massive or disseminated. Pyrite (FeS2) can be a pale yellow to brass-yellow in colour that is often tarnished black or brown and can sometimes be iridescent. Lustre is metallic and streak is greenish black. Hardness is 6 to 6 1/2. Pyrite usually occurs as cubic or pyritohedrons with parallel striations on the faces but can also be octahedron, nodules, massive, fine to coarse granular or fibrous.