mineral

Banded Agate

Cryptocrystalline Quartz (SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Gray, brown, and tan with distinct banding; Luster: Waxy to vitreous; Crystal Structure: Hexagonal (microcrystalline); Specific Gravity: 2.58-2.64.

Hardness: 6
Color: Gray, brown, and tan with distinct banding
Luster: Waxy to vitreous

Identified June 30, 2026More mineral →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Gray, brown, and tan with distinct banding; Luster: Waxy to vitreous; Crystal Structure: Hexagonal (microcrystalline); Specific Gravity: 2.58-2.64.

Formation & geological history

Formed primarily in volcanic and metamorphic rocks through the deposition of silica from groundwater into cavities (vesicles). Layers form over time, often representing different mineral impurities.

Uses & applications

Commonly used for lapidary work, jewelry (cabochons), polished decorative stones, and historical precision tools like mortars and pestles.

Geological facts

Agate is named after the Achates River in Sicily where it was first discovered by Greek philosopher Theophrastus. It has been used for over 3,000 years for gemstone carving.

Field identification & locations

Identify in the field by its translucency when held to light, waxy exterior texture, and characteristic curved or concentric banding pattern. Commonly found in riverbeds or volcanic regions.