gemstone

Polished agate beads (likely assorted dyed agates)

Agate, a banded variety of microcrystalline quartz (SiO₂)

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; beads show varied colors and opaque-to-translucent patterns, with a waxy to vitreous luster. Agate has a trigonal quartz structure and no prominent cleavage; polishing and possible dyeing obscure diagnostic natural features.

Identified September 23, 2026More gemstone →

Explore Polished agate beads (likely assorted dyed agates) in the encyclopedia →

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Physical properties

Formation & geological history

Agate forms as silica-rich fluids fill cavities in volcanic rocks, depositing microcrystalline quartz in bands over time. Its age depends on the source deposit; agates occur in rocks of many geological ages.

Uses & applications

Used for jewelry, beads, ornaments, and small decorative objects; agate is also used for carvings and, less commonly, technical components.

Geological facts

Agate’s characteristic bands form through successive mineral deposition; strong, uniform colors in beads may result from dyeing.

Field identification & locations

The image shows a strand of polished, patterned beads, consistent with agate or other decorative stone beads, but exact identification is not possible from the photo. Agate is found worldwide, including Brazil, Uruguay, India, and the United States; check for banding and hardness, while noting treatments can alter appearance.