mineral

Yellow Chalcedony

Silicon Dioxide (SiO2) - Chalcedony

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs; Color: translucent yellow to amber; Luster: waxy to vitreous; Crystal structure: Trigonal (microcrystalline); Cleavage: none; Specific Gravity: 2.6

Hardness: 6
Color: translucent yellow to amber
Luster: waxy to vitreous

Identified July 9, 2026More mineral →

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Physical properties

Hardness: 6.5-7 Mohs; Color: translucent yellow to amber; Luster: waxy to vitreous; Crystal structure: Trigonal (microcrystalline); Cleavage: none; Specific Gravity: 2.6

Formation & geological history

Formed via precipitation of silica-rich fluids in volcanic rocks, sedimentary cavities, or hydrothermal veins. Often found as rounded pebbles due to water erosion.

Uses & applications

Commonly used in jewelry as cabochons, for ornamental carvings, and as decorative tumbling stones. Primarily a collector and metaphysical stone.

Geological facts

Chalcedony is a cryptocrystalline form of silica. Yellow varieties are often associated with sunlight and vitality in folklore and were used in ancient cylinder seals.

Field identification & locations

Identified by its waxy luster, translucency, and inability to be scratched by a steel blade. Commonly found on beaches or in riverbeds where volcanic rocks have eroded.