2.6" Tabular Barite, Quartz and Marcasite Association - Morocco
This specimen contains marcasite, quartz and bladed/tabular, yellow barite. The marcasite has a beautiful luster to it, as well as a wonderful clustered crystal structure. The quartz can be found in druzy form, hovering over the marcasite and barite crystals.
Barite, commonly spelled Baryte is well-known for its great range of colors and varied crystal forms and habits. It is a heavy mineral consisting of barium sulfate, and typically has the chemical formula of BaSO4. The barite group consists of baryte, celestine, anglesite and anhydrite. It's generally white to colorless, and is the main source of barium.
Silicon Dioxide, also know as SiO2 or Quartz, is the second most abundant mineral in the Earth's crust. Quartz crystals generally grow in silica-rich, hot watery solutions called hydrothermal environments, at temperatures between 100°C and 450°C, and usually under very high pressure. Quartz veins are formed when open fissures are filled with hot water during the closing stages of mountains forming, and can be hundreds of millions of years old.