Quartz and Pyrite

Three Samples. One sample composed mostly of brass-yellow octahedron euhedral Pyrite with visible parallel striations with some disseminated white Quartz. Smallest sample is composed of mostly colourless thin prismatic euhedral Quartz crystals with a vitreous lustre with some octahedral and cubic euhedral brass-yellow Pyrite. Largest sample is mostly composed of long thin prismatic colourless euhedral Quartz crystals with a vitreous lustre that is entwined with fine granular brass-yellow pyrite. Quartz (SiO2) comes in a variety of colours from white to purple. Lustre is vitreous or greasy and streak is white. Hardness is 7. Quartz usually occurs as long or short prismatic crystals that are terminated by a double rhombohedron and has striations crosswise. Quartz can also be granular, disseminated or massive. Pyrite (FeS2) can be pale yellow or brass-yellow and is often tarnished brown or black. Lustre is usually metallic but can be iridescent and streak is greenish black. Hardness is 6 to 6 1/2. Pyrite is commonly found in cubic forms with parallel striations on the faces. Pyrite can also occur as octahedrons, fine to coarse granular, fibrous, mammillary or stalactitic forms.