mineral

Banded Agate (Dyed)

SiO2 (Silicon Dioxide / Microcrystalline Quartz)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Grayish, translucent with magenta/pink dyed band and reddish inclusions; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None; Conchoidal fracture.

Hardness: 6
Luster: Waxy to vitreous

Identified July 23, 2026More mineral →

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Physical properties

Formation & geological history

Agate forms within cavities of volcanic or metamorphic rocks through the deposition of silica from groundwater in concentric layers. This specimen has been artificially dyed in sections to enhance pink tones.

Uses & applications

Popular for lapidary work, jewelry making, tumbled pocket stones, decorative display specimens, and gemstone collections.

Geological facts

Agate is a variety of chalcedony. Many commercial tumbled agates undergo dye processes using iron, chromium, or organic dyes because agate is porous and easily absorbs pigments along specific growth bands.

Field identification & locations

Identified by concentric or parallel banding pattern, smooth waxy feel, translucency, and Mohs hardness around 7. Common in Brazil, Uruguay, Madagascar, and the US (e.g., Lake Superior).