This specimen features purple fluorite crystals associated with quartz and a small amount of pyrite. This crystal cluster was collected from Mexico and comes with an acrylic display stand.
Fluorite also called fluorspar is the mineral form of calcium fluoride, CaF2. It is a colorful mineral both in visible and ultraviolet light and tends to crystalize in isometric cubes, though octahedral and more complex isometric forms are not uncommon. Some of the most common colors are purple, blue, green and yellow. It is a fairly soft mineral being a 3 on the Mohs scale.
It occurs very widely with over 9,000 significant deposits known worldwide.
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.