Black crystal in a black metal cage

This smoky crystal was discovered in Brazil, in the area of Minas Gerais. A smoky criystal almost black. It is a crystal druse: several crystal points that have been growing together and still linked. It is untouched, completely natural It owes its color to a natural irradiation ... Indeed, when aluminum impurities of the quartz, are close to a radioactiv mineral, like uranium or thorium contained inside granit for exemple, the color start changing gradually. Obviously, longer is the time of exposition, darker will be the crystal, like this one! But don't worry, this beautiful mineral is dangerous only if you drop it on your foot... And despite its age, it is incredibly contemporary, highlighted by this black steel structure.