mineral

Blue lace agate (likely dyed or color-enhanced)

Microcrystalline quartz (chalcedony), SiO₂

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; pale blue, opaque to translucent, with subtle cloudy or banded chalcedony texture and waxy to vitreous luster. No visible cleavage; conchoidal fracture; trigonal quartz structure.

Identified August 13, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities in volcanic rock, depositing chalcedony in layers over time, commonly during the Cenozoic. The unusually uniform vivid blue color may indicate dyeing or surface enhancement.

Uses & applications

Commonly used for cabochons, beads, carvings, polished stones, and ornamental objects; it has little industrial value compared with ordinary quartz.

Geological facts

Agate is a variety of chalcedony distinguished by cryptocrystalline quartz and often rhythmic banding. Blue lace agate naturally occurs most famously in Namibia, though dyed blue agates are widespread.

Field identification & locations

Identify by its fine-grained waxy surface, conchoidal fracture, and lack of obvious individual crystals; glassy bubbles or perfectly uniform color suggest imitation or dye. Common sources include Namibia, Brazil, Uruguay, and Mexico.