mineral

Banded Agate

Cryptocrystalline variety of Quartz (SiO2)

Hardness: 6.5-7 (Mohs scale). Color: Translucent tan, brown, and white with distinct banding. Luster: Waxy to vitreous. Crystal structure: Trigonal/Microcrystalline. Cleavage: None (Conchoidal fracture).

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

Identified June 30, 2026More mineral →

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Physical properties

Formation & geological history

Formed primarily in cavities of volcanic rocks (vesicles) or metamorphic rocks by the deposition of silica from groundwater. The characteristic bands are formed by rhythmic crystallization changes over time.

Uses & applications

Widely used for lapidary arts, jewelry (cabochons), ornamental carvings, and as a semi-precious gemstone. Historically used for making precision bearings and mortars/pestles due to its hardness.

Geological facts

Agate is often named after the Achates River in Sicily where it was first discovered. The circular or parallel bands represent 'fossilized' records of the geochemical environment at the time of deposit.

Field identification & locations

Identify in the field by its translucency when held to light, smooth waxy texture when wet, and the presence of parallel concentric bands. Commonly found in riverbeds, gravel pits, and volcanic regions like the Lake Superior area.

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sedimentary

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Gypsum (variety Selenite or Alabaster)

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Mineral

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock