mineral

Pink agate geode

Microcrystalline quartz (chalcedony), SiO₂, with quartz crystals and iron-oxide coloration

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; translucent pink, white-banded chalcedony with a drusy quartz-lined cavity; vitreous to waxy luster, no cleavage, and conchoidal fracture. The pink-to-red colors likely result from iron-bearing inclusions or treatments.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

A silica-rich cavity in volcanic rock was gradually filled by groundwater, depositing concentric chalcedony bands followed by quartz crystals. Such geodes commonly formed in Cenozoic to Mesozoic volcanic flows, especially in Brazil, Uruguay, and Mexico.

Uses & applications

Used as a decorative display slab, lapidary material, and jewelry component; attractive specimens are popular among collectors and interior designers.

Geological facts

The specimen is a cut and polished geode half, not a solid pink mineral. Its concentric banding records repeated changes in fluid chemistry during cavity growth.

Field identification & locations

Identify by sealed concentric agate bands surrounding a hollow, crystal-lined center; quartz scratches glass, while agate does not react with dilute acid. Common sources include Rio Grande do Sul, Brazil, and Artigas, Uruguay.