mineral

Banded Agate

Agate (Cryptocrystalline variety of Quartz, SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Multi-colored bands (white, orange, brown, grey); Luster: Waxy to vitreous; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Fracture: Conchoidal; Specific Gravity: 2.58-2.64

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

Identified May 23, 2026More mineral →

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Physical properties

Formation & geological history

Formed in cavities within volcanic or metamorphic rocks through the secondary deposition of silica from groundwater. The bands represent different pulses of mineral-rich fluids over thousands of years.

Uses & applications

Commonly used in jewelry (cabochons, beads), decorative ornaments, mortar and pestles for laboratories due to its hardness, and as a collector's gemstone.

Geological facts

Agate is named after the Achates River in Sicily where it was first discovered. The 'Lake Superior Agate' is a famous variety known for its vibrant red and orange iron staining.

Field identification & locations

Identify by its waxy texture, translucency when held to light, and distinct concentric or parallel banding. To clean for display, use warm soapy water.

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