sedimentary

Agate Geode with Quartz Druzy

Cryptocrystalline Quartz (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7.0 (Mohs scale), Color: Banded white, tan, and grey with a clear druzy center, Luster: Vitreous to waxy, Crystal Structure: Trigonal/Microcrystalline, Cleavage: None/Conchoidal fracture, Specific Gravity: 2.58-2.64

Hardness: 6

Identified June 25, 2026More sedimentary →

Explore Agate Geode with Quartz Druzy 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 through the deposition of silica from groundwater in cavities (vesicles) within igneous or sedimentary rocks. Over millions of years, layers of chalcedony deposit along the walls, eventually forming the internal druzy crystals.

Uses & applications

Used primarily in lapidary arts, jewelry (cabochons), interior decor as bookends or display pieces, and collected by mineral enthusiasts.

Geological facts

Agate is named after the Achates River (now the Dirillo River) in Sicily. Geodes are unique because they are hollow, often holding well-formed crystals that were protected from environmental wear for millions of years.

Field identification & locations

Identify in the field by looking for nodular, rounded rocks with a rough, 'cauliflower-like' exterior. Often found in volcanic regions or limestone beds. Brazil and Uruguay are top producers of high-quality quartz-lined agates.