mineral

Amethyst-bearing quartz (rough specimen)

Quartz, SiO₂; purple coloration is commonly caused by iron-related color centers

AI-generated identification · may be incorrect

Mohs hardness 7; pale purple and white, vitreous luster, trigonal crystal structure, and no true cleavage. The specimen appears to be rough quartz with a small amethyst-colored area; exact identification is limited by the photo.

Identified October 3, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich fluids in cavities and veins, often in volcanic rocks; amethyst forms when trace iron and natural radiation color the quartz. Its age depends on the deposit and cannot be determined from the image.

Uses & applications

Amethyst is used in jewelry, ornaments, and mineral collections; quartz also has extensive industrial uses in glass, electronics, and abrasives.

Geological facts

Amethyst is the purple variety of quartz, and its color may fade with prolonged heat or strong sunlight.

Field identification & locations

Look for hardness near 7, glassy luster, and purple coloration within quartz; common sources include Brazil, Uruguay, Zambia, and other quartz-bearing regions. Similar-looking purple minerals may require testing for confirmation.