ALL minerals form below the earth's crust from magma. They can then be uplifted to the surface. Quartz is one of the first to form out of the magma.
Amethyst is a violet form of quartz.
Quartz is silicon dioxide, SiO2.
Amethyst is a form of quartz that that contains impurities that make it purple.
Fracture
SiO2 is quartz- a nautural piezo-electric compound when in crystalline form.
Amethyst is a violet form of quartz.
Amethyst is the purple form of quartz.
Amethyst is a violet form of quartz.
during heat prusure and time it changers from quartz to smoky quartz
Quartz is silicon dioxide, SiO2.
Quartz is and is also a mineral
Amethyst is a form of quartz that that contains impurities that make it purple.
Aventurine
Aventurine
gemstone
Quartz.
Smoky quartz is normally found in granite mountains. Smoky quartz is regular quartz which is exposed to radiation on a long term basis.