mineral

Banded Agate (specifically Lace Agate type)

Silicon Dioxide (SiO2)

Hardness: 6.5-7 on the Mohs scale. Color: Multicolored with bands of white, grey, brown, and red. Luster: Waxy to vitreous. Crystal structure: Cryptocrystalline (Trigonal). Cleavage: None. Specific gravity: 2.58–2.64.

Hardness: 6
Color: Multicolored with bands of white, grey, brown, and red
Luster: Waxy to vitreous

Identified May 16, 2026More mineral →

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Physical properties

Formation & geological history

Formed primarily in volcanic and metamorphic rocks. It occurs when silica-rich groundwater fills cavities (vesicles) in igneous rocks, depositing layers of microcrystalline quartz over long periods of time.

Uses & applications

Widely used in jewelry (cabochons, beads), decorative carvings, and as a gemstone for collectors. Historically used for making hardstone carvings and precision tools like mortars and pestles.

Geological facts

The distinct banding is caused by rhythmic crystallization of silica. Each layer represents a different pulse of mineral-rich fluids entering the cavity. Agate has been used by humans since the Neolithic era.

Field identification & locations

Identify by its characteristic colorful banding and waxy texture on broken surfaces. Often found as nodules in riverbeds or volcanic fields. High-quality specimens with intricate 'eye' patterns or 'lace' formations are highly prized.

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