mineral

Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Hardness: 6.5–7 (Mohs scale); Color: Bright purple (unnatural) and black; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Specific Gravity: 2.58–2.64

Hardness: 6
Color: Bright purple (unnatural) and black
Luster: Vitreous to waxy

Identified March 15, 2026More mineral →

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Physical properties

Hardness: 6.5–7 (Mohs scale); Color: Bright purple (unnatural) and black; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Specific Gravity: 2.58–2.64

Formation & geological history

Formed as a result of volcanic activity, specifically gas bubbles in lava filling with silica-rich groundwater. Most dyed specimens originates from Brazil or Uruguay and are processed in workshops globally.

Uses & applications

Used primarily for decorative items, inexpensive jewelry (beads, cabochons), metaphysical uses, and as entry-level specimens for young rock collectors.

Geological facts

Natural agate does not occur in this neon/vibrant shade of purple. The process involves soaking porous chalcedony in chemical dyes (like potassium ferrocyanide or chromium salts) to enhance market appeal.

Field identification & locations

Identify by looking for 'pooling' of color in cracks and a neon hue that doesn't appear in nature. Commonly found in gift shops and tourist bins. To verify if it is dyed, one can soak a small corner in acetone.

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