Agate with Druzy Quartz: Banded Chalcedony, Crystal Cavities & Display Value

Agate is banded chalcedony, a microcrystalline form of quartz. When cavities remain open during formation, later quartz crystals can line those spaces and create sparkling druzy interiors.

Banding tells part of the story

Agate bands form through repeated silica deposition. Differences in impurities and growth conditions can create contrasting layers of cream, gray, brown, gold and other tones.

Druzy adds a second texture

Where a cavity remains, tiny quartz crystals may grow across the open surface. That contrast between smooth banded chalcedony and glittering crystal texture is one reason agate slices are so popular for display.

A large example from our catalog

Our current 76.1 oz polished agate slice features warm banding surrounding a central golden druzy quartz cavity.

View the 76.1 oz agate and druzy specimen.

Explore more agate and jasper material.