sedimentary

Banded Agate

Silicon dioxide (SiO2) - variety of Chalcedony

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Red, brown, tan, and white bands; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.64

Hardness: 6
Color: Red, brown, tan, and white bands
Luster: Waxy to vitreous

Identified July 14, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Red, brown, tan, and white bands; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.64

Formation & geological history

Formed in cavities of volcanic rock or ancient sedimentary formations where silica-rich groundwater deposited layers over time. This tumbled specimen likely originated from river deposits.

Uses & applications

Used primarily for jewelry (beads, cabochons), home decor, meditation stones, and as a durable abrasive in industrial polishing lapidary work.

Geological facts

Agate is named after the Achates River in Sicily. Each agate is unique because the banding patterns are formed by localized mineral impurities and fluctuating pressure during slow mineral growth.

Field identification & locations

Identify by its characteristic banding, hardness (it can scratch glass), and waxy feel when polished. Commonly found in riverbeds, lakeshores, and volcanic outcrops globally.