mineral

Agate Geode with Quartz

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: White, gray, orange-red banding; Luster: Waxy to vitreous; Structure: Microcrystalline (agate) and macrocrystalline (quartz); Cleavage: None/Conchoidal fracture.

Hardness: 6
Color: White, gray, orange-red banding
Luster: Waxy to vitreous

Identified July 19, 2026More mineral →

Explore Agate Geode with Quartz in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Hardness: 6.5-7 (Mohs); Color: White, gray, orange-red banding; Luster: Waxy to vitreous; Structure: Microcrystalline (agate) and macrocrystalline (quartz); Cleavage: None/Conchoidal fracture.

Formation & geological history

Formed as secondary deposits in volcanic rock cavities (vugs). Silica-rich groundwater percolated through the cavity, depositing layers of chalcedony (agate) followed by crystalline quartz over millions of years.

Uses & applications

Decorative display specimens, lapidary arts (cabochons), jewelry, and geological collecting.

Geological facts

The banded layers represent individual pulses of mineral-rich water. The red coloration in the agate bands is typically caused by iron oxide (hematite) inclusions.

Field identification & locations

Look for rounded, potato-like nodules with a rough exterior in volcanic or sedimentary beds. A broken or cut face will reveal the hollow center or internal crystallization. Common in locations like Brazil, Mexico, and the western United States.