mineral
Amethyst Geode
Quartz (Silicon Dioxide, SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, purple to violet color, vitreous luster, trigonal crystal system, and conchoidal fracture with no cleavage.
Identified More mineral →
Explore Amethyst Geode in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 7 on the Mohs scale, purple to violet color, vitreous luster, trigonal crystal system, and conchoidal fracture with no cleavage.
Formation & geological history
Formed within hollow cavities in volcanic or sedimentary rocks through the slow precipitation of silica-rich groundwater over millions of years.
Uses & applications
Widely used in jewelry, ornamental carvings, crystal healing, and as highly prized mineral specimens for collectors.
Geological facts
The purple color is caused by natural irradiation and trace amounts of iron substituting for silicon in the crystal lattice. Famous large deposits are found in Brazil and Uruguay.
Field identification & locations
Easily identified by its distinctive outer rock crust lined with inward-growing purple quartz crystals. Found globally in volcanic regions.
