mineral

Tumbled blue lace agate

Banded chalcedony, a microcrystalline variety of quartz (SiO₂)

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; pale blue and white bands, vitreous to waxy luster, cryptocrystalline structure, no visible cleavage; specific gravity about 2.6.

Identified October 12, 2026More mineral →

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Physical properties

Hardness 6.5–7 Mohs; pale blue and white bands, vitreous to waxy luster, cryptocrystalline structure, no visible cleavage; specific gravity about 2.6.

Formation & geological history

Silica-rich fluids deposited successive layers in cavities, later forming banded chalcedony. Blue lace agate is best known from Proterozoic deposits in Namibia, though the specimen’s source cannot be determined from the image.

Uses & applications

Tumbled stones are used in jewelry, beads, and collections; agate is also used for ornaments and small decorative objects.

Geological facts

Agate is prized for its layered patterns, and polishing reveals bands that may be subtle on rough material.

Field identification & locations

The smooth, rounded shape and fine blue-and-white parallel bands are characteristic of tumbled blue lace agate. Check for natural-looking banding and a cool, hard silica surface; similar agates occur in several regions.