mineral

Amethyst geode or druzy quartz specimen

Quartz, SiO₂; purple coloration is typically caused by iron-related defects and irradiation

AI-generated identification · may be incorrect

The image appears to show a polished or resin-mounted cavity containing pale crystalline quartz, possibly amethyst. Quartz is Mohs hardness 7, vitreous luster, trigonal crystal structure, no cleavage, and specific gravity about 2.65; exact color and crystal habit are obscured by the coating or mount.

Identified August 26, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystals commonly line gas cavities in volcanic rocks, especially basalt, forming geodes during low-temperature hydrothermal activity. Ages vary widely, from relatively young volcanic deposits to hundreds of millions of years old.

Uses & applications

Used for jewelry, mineral specimens, lapidary décor, and metaphysical collecting; quartz is also important industrially in glass, electronics, and abrasives.

Geological facts

Amethyst is purple quartz, while pale or colorless cavity crystals may be ordinary quartz or calcite rather than amethyst. The surrounding dark teal material appears human-applied resin, lacquer, or a polished host rather than natural rock.

Field identification & locations

Check for six-sided crystal points, glassy luster, and scratch resistance against steel; acid testing can distinguish calcite, while quartz will not fizz. Common sources include Brazil, Uruguay, Mexico, and Namibia.