mineral

Amethyst druzy geode slice

Quartz (SiO₂), purple amethyst variety, with chalcedony and iron-oxide inclusions

AI-generated identification · may be incorrect

Typically Mohs hardness 7, vitreous luster, hexagonal quartz crystals, and no prominent cleavage; this specimen shows purple druzy crystals on gray-blue chalcedony with rusty orange iron staining. Specific gravity is about 2.65.

Identified September 13, 2026More mineral →

Explore Amethyst druzy geode slice in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed when silica-rich groundwater filled cavities in volcanic rock, depositing banded chalcedony followed by quartz crystals; the purple color results mainly from iron impurities and irradiation. Exact age depends on its deposit, commonly Cenozoic to Mesozoic.

Uses & applications

Used as a decorative specimen, jewelry material, and lapidary stone; druzy surfaces are especially popular in display pieces and cabochons.

Geological facts

“Druzy” describes a coating of many tiny crystals, while a geode is a hollow or partly hollow mineral-lined cavity. Heating amethyst can produce yellow-orange citrine-like material.

Field identification & locations

Identify it by testing for quartz hardness, observing purple hexagonal crystals, and checking for banded chalcedony and iron staining; common sources include Brazil, Uruguay, Mexico, and Morocco.