Dyed Agate

Physical Properties

Hardness: 6.5-7 (Mohs scale); Color: Naturally gray/white with artificial pink/magenta dye; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58–2.64

Formation & Geological History

Formed in cavities within volcanic rocks or ancient lavas. This specific specimen has been tumbled and artificially color-enhanced via chemical dye absorption through its porous structure.

Uses & Applications

Commonly used in lapidary work, jewelry, decorative ornaments, and as pocket stones for collectors. Historically used for mortars and pestles due to hardness.

Geological Facts

Agate dyeing is a practice dating back to Ancient Roman times. The vibrant neon-pink or magenta bands seen here are not natural and are used to make the rhythmic banding of the chalcedony more visually striking.

Field Identification & Locations

Identify in the field by its waxy texture and band patterns. If the color looks too bright to be natural or is concentrated in surface cracks, it is likely dyed. Common in Brazil, Uruguay, and India.

Identified on: 4/13/2026

Mode: Standard