mineral

Banded Agate (Crazy Lace / Botswana Agate Beads)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Concentric or wavy bands of brown, grey, white, tan, and orange; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None, exhibits conchoidal fracture; Specific Gravity: 2.58-2.64

Hardness: 6
Luster: Waxy to vitreous

Identified July 24, 2026More mineral →

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Physical properties

Formation & geological history

Formed in cavities within volcanic rocks (lavas) where silica-rich fluids deposited successive layers of microcrystalline quartz over extended periods, creating distinctive color banding.

Uses & applications

Widely used for bead making, jewelry crafting, lapidary art, carvings, and ornamental gemstone collections.

Geological facts

Agate banding is created by subtle changes in trace mineral inclusions (such as iron oxides and hydroxides) during layer-by-layer precipitation from hydrothermal solutions.

Field identification & locations

Identified by distinct wavy, fine-grained concentric banding and translucent to opaque body. Commonly found in Brazil, Botswana, Mexico, and Madagascar. Popular in jewelry making due to its durability and unique natural patterns.