mineral

Banded Agate

Agate (Cryptocrystalline Quartz, SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Multi-colored bands of white, grey, brown; Luster: Waxy to vitreous; Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.64

Hardness: 6
Color: Multi-colored bands of white, grey, brown
Luster: Waxy to vitreous

Identified July 1, 2026More mineral →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Multi-colored bands of white, grey, brown; Luster: Waxy to vitreous; Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.64

Formation & geological history

Formed in volcanic or metamorphic rock cavities where silica-rich groundwater deposits layers of quartz over long periods. Often found in geodes.

Uses & applications

Used primarily in lapidary arts for jewelry, cabochons, and decorative carvings, as well as industrial burnishing tools and mortar and pestles due to its hardness.

Geological facts

Agate is named after the Achates River in Sicily where it was first discovered. The distinctive banding is created by rhythmic crystallization from a silica-rich gel.

Field identification & locations

Identify by its characteristic colorful banding and translucent light transmission. Commonly found in gravel beds or volcanic regions like the Lake Superior area.