Quartz is one of the most common minerals, making up almost 12% of the Earth’s crust It is also known as silicon dioxide and is encountered in sedimentary and volcanic rocks. When found at high temperature during the last phase of its precipitation, quartz crystallizes within only a few months. It is mined in Brazil, Japan, America and Switzerland.
Smoky Quartz Smoky quartz is a brownish gray, transparent quartz variety. It got its name due to its fuming smoky color which results from free silicon ions formed by natural irradiation. It is usually mined in Brazil, the USA, and Switzerland. The very dark smoky quartz variety is called morion.