mineral

Banded Agate

Cryptocrystalline Quartz (SiO2)

Hardness: 6.5-7 Mohs; Color: Pale blue, white, and translucent gray; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture).

Hardness: 6
Color: Pale blue, white, and translucent gray
Luster: Waxy to vitreous

Identified July 15, 2026More mineral →

Explore Banded Agate 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: Pale blue, white, and translucent gray; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture).

Formation & geological history

Formed in cavities (vesicles) of volcanic rocks through the deposition of silica from groundwater. The bands represent different stages of mineral deposition over thousands of years. Usually found in Cenozoic era basaltic flows.

Uses & applications

Commonly used in lapidary arts for jewelry, figurines, and cabochons. Industrially used for making mortars and pestles because of its hardness and resistance to chemicals. Highly valued by amateur rockhounds.

Geological facts

Agate is named after the Achates River (now the Dirillo River) in Sicily, where it was first discovered in ancient times. The blueish-translucent color in this specimen is often referred to as 'Blue Chalcedony' or 'Blue Lace' when finely banded.

Field identification & locations

Identified by its distinctive bands, waxy texture, and lack of visible crystal grains. Collectors should look for nodules in gravel pits, riverbeds, or weathered volcanic ash deposits. It is often found with a rough, brown, cauliflower-like exterior.