mineral

Blue Chalcedony

Cryptocrystalline Quartz (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Pale blue to lavender-grey; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Monoclinic microcrystalline fiber; Specific Gravity: 2.58-2.64

Hardness: 6
Color: Pale blue to lavender-grey
Luster: Vitreous to waxy

Identified June 29, 2026More mineral →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Pale blue to lavender-grey; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Monoclinic microcrystalline fiber; Specific Gravity: 2.58-2.64

Formation & geological history

Formed at relatively low temperatures through the deposition of silica-rich water in volcanic cavities, fissures, and sedimentary rocks. Common in Cenozoic era formations.

Uses & applications

Primarily used as a gemstone for jewelry (cabochons, beads), decorative carvings, and in metaphysical collecting.

Geological facts

In antiquity, it was believed to represent the elements of air and water. Famous deposits in Namibia and Turkey are known for the highest quality uniform blue specimens.

Field identification & locations

Identified by its waxy luster, translucency, and inability to be scratched by a steel knife. Frequently found in agate-rich regions or as nodules in basalt and limestones.