mineral
Amethyst druzy slab
Amethyst (purple quartz), SiO₂
AI-generated identification · may be incorrectViolet, glassy crystals lining a flat slab; quartz has trigonal crystal structure, Mohs hardness 7, no cleavage, and specific gravity about 2.65. The underlying host rock is not identifiable from the image.
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Physical properties
Violet, glassy crystals lining a flat slab; quartz has trigonal crystal structure, Mohs hardness 7, no cleavage, and specific gravity about 2.65. The underlying host rock is not identifiable from the image.
Formation & geological history
Amethyst forms as quartz crystals in mineral-rich fluids, commonly lining cavities in volcanic rocks; specimens can range from geologically young to hundreds of millions of years old.
Uses & applications
Used for display, jewelry, and lapidary work; druzy slabs are popular decorative and collectible pieces.
Geological facts
Amethyst’s purple color is associated with trace iron and natural irradiation; color may be uneven or treated in commercial specimens.
Field identification & locations
Identify by its purple quartz crystals and glassy luster; major sources include Brazil, Uruguay, Zambia, and Mexico. The image alone cannot establish locality or whether the surface has been treated.
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