gemstone

Tumbled blue gemstone, likely blue quartz or dyed chalcedony

Quartz (SiO₂), possibly chalcedony; exact identification requires testing

AI-generated identification · may be incorrect

Rounded and polished, translucent blue with pale cloudy zones and a vitreous-to-waxy luster. Quartz hardness is Mohs 7, trigonal crystalline; chalcedony is microcrystalline quartz with no visible cleavage and specific gravity about 2.6.

Identified September 20, 2026More gemstone →

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Physical properties

Formation & geological history

Natural blue quartz is uncommon and gains color from inclusions or irradiation; blue chalcedony forms in silica-rich cavities. Strong, even blue color may indicate dyeing, while the tumbled shape is human-processed.

Uses & applications

Used mainly as a decorative or lapidary stone, bead, worry stone, or inexpensive collectible; not generally valuable as fine jewelry material.

Geological facts

The image cannot distinguish blue quartz, blue chalcedony, dyed agate, or glass with certainty. Natural stones usually show uneven color, inclusions, and conchoidal fracture rather than cleavage.

Field identification & locations

Check for dye concentration in cracks or drill holes, bubbles (suggesting glass), hardness against steel or glass, and a streak test; laboratory refractive-index or spectroscopy testing is definitive. Similar material occurs in Brazil, Madagascar, Namibia, Turkey, and the United States.