gemstone

Dyed Agate

Cryptocrystalline variety of Silica (SiO2)

Hardness: 6.5-7 Mohs; Color: Naturally translucent gray/brown, here dyed pink, purple, and magenta; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture).

Hardness: 6
Luster: Waxy to vitreous

Identified July 21, 2026More gemstone →

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Physical properties

Formation & geological history

Primary formation occurs in volcanic rocks (lavas) where silica-rich groundwater fills gas cavities (vesicles). These specimens are tumbled, sliced, and artificially dyed to enhance color.

Uses & applications

Commonly used in jewelry (beads, pendants), decorative ornaments, bookends, and collection pieces for beginners.

Geological facts

Agate was first discovered along the Achates River in Sicily. It is unique among minerals for its beautiful concentric banding, which is caused by rhythmic crystallization layers.

Field identification & locations

Identify by characteristic banding and waxy texture. In jewelry, bright unnatural colors (like neon pink or deep purple) on banded stones are a definitive sign of industrial dyeing.

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