mineral

Banded Agate (specifically Moss or River Agate variety)

Cryptocrystalline Quartz (SiO2)

Hardness: 6.5–7 on the Mohs scale. Color: Translucent white to tan with brown or black dendritic/banded inclusions. Luster: Vitreous to waxy. Crystal Structure: Trigonal/Microcrystalline. Cleavage: None (conchoidal fracture).

Hardness: 6
Luster: Vitreous to waxy

Identified March 28, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica from groundwater in the cavities of igneous rocks such as basalt or rhyolite. The banding and inclusions are caused by varying levels of iron, manganese, or other mineral oxides during the crystallization process.

Uses & applications

Commonly used in jewelry (cabochons, beads), decorative carvings, and as a popular specimen for rock tumbling and collection. Historically used for making precision bearings and mortars and pestles because of its hardness.

Geological facts

Agates were named by the Greek philosopher Theophrastus, who found them in the Achates River in Sicily. Because of their microcrystalline structure, they are incredibly durable and can maintain a high polish for centuries.

Field identification & locations

Identify in the field by its translucency (hold to light), waxy feel when wet/polished, and characteristic banding or moss-like inclusions. Frequently found in riverbeds, gravel pits, and volcanic regions globally (notably Brazil, India, and the Midwestern US).

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