mineral

Chalcedony (Yellow/Honey variety)

Microcrystalline Quartz (SiO2)

Hardness: 6.5–7 on the Mohs scale. Color: Translucent honey-yellow with iron-oxide inclusions. Luster: Waxy to vitreous. Crystal structure: Trigonal (microcrystalline/cryptocrystalline). Cleavage: None (conchoidal fracture). Specific gravity: 2.60–2.64.

Hardness: 6
Color: Translucent honey-yellow with iron-oxide inclusions
Luster: Waxy to vitreous

Identified March 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed from the deposition of silica-rich groundwater in cavities of volcanic rocks or sedimentary layers. It typically forms at relatively low temperatures as a secondary mineral during the late stages of hydrothermal activity.

Uses & applications

Commonly used for lapidary work, cabochons for jewelry, decorative carvings, and as a semi-precious gemstone for collectors.

Geological facts

In antiquity, chalcedony was used to make seals because wax does not stick to it. The name is believed to derive from the ancient Greek town of Chalkedon in Asia Minor.

Field identification & locations

Identify by its waxy luster, lack of visible crystals, and conchoidal fracture. Found worldwide, notably in the USA (Oregon, Arizona), Brazil, and India. Collectors should look for translucency and smooth, 'bubbly' (botryoidal) surfaces on unweathered faces.

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