mineral

Yellow Chalcedony (likely Carnelian or Yellow Agate)

Silicon Dioxide (SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Translucent yellow to honey-orange; Luster: Waxy to vitreous; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.64

Hardness: 6
Color: Translucent yellow to honey-orange
Luster: Waxy to vitreous

Identified July 1, 2026More mineral →

Explore Yellow Chalcedony (likely Carnelian or Yellow Agate) in the encyclopedia →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Translucent yellow to honey-orange; Luster: Waxy to vitreous; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.64

Formation & geological history

Formed from the deposition of silica in cavities of volcanic rocks (basalt) or sedimentary rocks. The yellow color is primarily due to embedded iron oxide (limonite) or goethite impurities.

Uses & applications

Commonly used for lapidary work, jewelry (cabochons and beads), ornamental carvings, and as a popular stone for chakra healing and crystal collections.

Geological facts

Chalcedony is one of the oldest materials used by humans for tools and jewelry. Yellow varieties are often associated with the solar plexus chakra in metaphysical practices and are frequently found as river-worn pebbles.

Field identification & locations

Identify by its waxy luster, lack of visible crystals (microcrystalline), and smooth conchoidal fracture. Often found in gravel beds or volcanic areas. Common locations include Brazil, India, Madagascar, and the USA (Oregon/Washington).

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