mineral
Amethyst (likely tumbled or polished)
Quartz, SiO₂; purple color commonly caused by trace iron and natural irradiation
AI-generated identification · may be incorrectLikely Mohs hardness 7, vitreous luster, and hexagonal crystal structure; purple color and uneven fracture are visible, but the image is too blurry to confirm details or identify treatment.
Identified More mineral →
Explore Amethyst (likely tumbled or polished) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Likely Mohs hardness 7, vitreous luster, and hexagonal crystal structure; purple color and uneven fracture are visible, but the image is too blurry to confirm details or identify treatment.
Formation & geological history
Amethyst forms in silica-rich fluids, commonly lining cavities in volcanic rocks; specimens range from geologically young to hundreds of millions of years old.
Uses & applications
Used in jewelry, ornamental objects, and mineral collections.
Geological facts
Amethyst is the purple variety of quartz; heating can lighten or alter its color.
Field identification & locations
Look for purple quartz with glassy luster and hardness sufficient to scratch ordinary glass. Common sources include Brazil, Uruguay, Zambia, and other volcanic regions.
