Blue Chalcedony (Tumbled)

Physical Properties

Hardness: 6.5-7 (Mohs scale); Color: Pale blue to deep teal-blue; Luster: Waxy to vitreous; Crystal Structure: Trigonal (cryptocrystalline); Specific Gravity: 2.58–2.64.

Formation & Geological History

Formed in low-temperature hydrothermal environments where silica-rich fluids deposit in volcanic rock cavities or sedimentary fissures. This specific color is often enhanced through dye in the lapidary trade.

Uses & Applications

Commonly used in the jewelry industry for cabochons and beads, as well as for decorative carvings, palm stones, and metaphysical collecting.

Geological Facts

Chalcedony is a cryptocrystalline form of silica, composed of very fine intergrowths of quartz and moganite. Blue varieties are particularly popular in jewelry design and are often associated with calm and communication in folklore.

Field Identification & Locations

Identify in the field by its waxy luster, lack of visible crystals, and conchoidal fracture. Found worldwide, with notable deposits in Namibia, Turkey, and India. Check for color consistency to determine if the specimen has been artificialy dyed.

Identified on: 4/22/2026

Mode: Standard