mineral

Banded Agate

Cryptocrystalline Quartz (SiO2)

Hardness: 6.5-7 on Mohs scale. Color: Brown, tan, and reddish-orange bands. Luster: Waxy to vitreous. Crystal Structure: Hexagonal (cryptocrystalline). Cleavage: None (conchoidal fracture).

Hardness: 6
Color: Brown, tan, and reddish-orange bands
Luster: Waxy to vitreous

Identified May 18, 2026More mineral →

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Physical properties

Hardness: 6.5-7 on Mohs scale. Color: Brown, tan, and reddish-orange bands. Luster: Waxy to vitreous. Crystal Structure: Hexagonal (cryptocrystalline). Cleavage: None (conchoidal fracture).

Formation & geological history

Formed by the deposition of silica from groundwater in the cavities of igneous rocks or volcanic vesicles. Over millions of years, varying mineral inclusions create the distinct color banding.

Uses & applications

Commonly used in jewelry (beads, cabochons), ornamental turnings, bookends, and gathered by mineral collectors. Industrially used in mortars and pestles for chemical mixing due to hardness.

Geological facts

The name 'Agate' comes from the Achates River in Sicily. Each agate specimen is unique due to the specific mineral impurities present during its slow formation process.

Field identification & locations

Identify in the field by its translucent wax-like appearance when held to light and its characteristic concentric or parallel banding. Often found in gravel beds or near volcanic outcrops.