mineral

Agate (Bead Form)

Agate (Cryptocrystalline Quartz, SiO2)

Hardness: 6.5–7 on Mohs scale; Color: Multi-colored banding, translucent to opaque browns and greys; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (cryptocrystalline); Cleavage: None; Specific Gravity: 2.58–2.64.

Hardness: 6
Luster: Vitreous to waxy

Identified March 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed in cavities of volcanic rocks or ancient lavas, often as secondary deposits from groundwater carrying silica. The banding represents layers of silica deposition over many thousands of years.

Uses & applications

Commonly used in lapidary arts, jewelry (beads, pendants), orbital burnishers, and historically for talismans and decorative carvings.

Geological facts

Agate is one of the oldest materials used for jewelry in human history. The translucent, mottled appearance frequently seen in beads like these is typical of Indian or Brazilian 'moss' or 'banded' chalcedony varieties.

Field identification & locations

Identify by its hardness (will scratch glass), waxy luster when polished, and characteristic banding or cloud-like inclusions. Found globally with significant deposits in Brazil, Uruguay, and India.

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