2.85" Polished Rubellite (Tourmaline) & Quartz Sphere - Madagascar
This is a 2.85" wide, hand polished sphere made from pink tourmaline (rubellite) in quartz. This rock formation was collected from Madagascar. Comes with the pictured display stand. There appears to be a small chip in the sphere that has been stabilized with glue.
Tourmaline is a crystalline boron silicate mineral compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium. Schorl, or black tourmaline, is the most common form of tourmaline, and has been used for everything from jewelry to piezoelectric guitar pickups.
Silicon Dioxide, also known 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.