mineral

Dyed or coated quartz geode

Quartz geode; silicon dioxide (SiO₂), likely artificially color-enhanced

AI-generated identification · may be incorrect

Hardness 7 Mohs; typically white to gray chalcedony outer rind with sparkling drusy quartz lining. Vitreous to sugary luster, trigonal quartz crystals, and no prominent cleavage; vivid blue, red, green, and orange colors strongly indicate dye or coating.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Geodes form when gas cavities in volcanic rocks are later lined by chalcedony and quartz from groundwater. This specimen is likely a commercially processed geode, commonly sourced from Brazil or Uruguay; its original formation may range from Mesozoic to Cenozoic depending on locality.

Uses & applications

Used mainly as a decorative or educational specimen and inexpensive mineral display piece; untreated quartz geodes have modest collecting value.

Geological facts

The multicolored zoning is not typical of natural quartz and is commonly produced by soaking or surface treatment. A white, gray, or tan rind surrounding a hollow, sparkly interior is characteristic of a geode.

Field identification & locations

Identify it by the hollow cavity, banded chalcedony rind, and drusy quartz crystals; dye may concentrate in cracks and porous areas. Common sources include Brazil, Uruguay, Mexico, and Morocco.