mineral

Banded Agate

Agate (Silicon Dioxide / SiO2)

Hardness: 6.5-7 (Mohs scale), Color: Multicolored bands (red, orange, white, brown), Luster: Waxy to vitreous, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline quartz), Cleavage: None, Specific Gravity: 2.60-2.65

Hardness: 6

Identified May 9, 2026More mineral →

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Physical properties

Formation & geological history

Formed in cavities within volcanic or metamorphic rocks when silica-rich fluids deposit layers over time. Colors are caused by various mineral impurities such as iron and manganese.

Uses & applications

Used primarily in jewelry (cabochons, beads), decorative carvings, and as a collector's stone. Historically used for making knife edges and seals due to hardness.

Geological facts

Named after the Achates River in Sicily where agates were first discovered. Agates are unique because every single specimen has a distinct banding pattern.

Field identification & locations

Identify by its waxy luster, distinct parallel banding, and ability to scratch glass. Commonly found in Brazil, India, Uruguay, and various parts of the USA (like Lake Superior).