mineral

Blue Lace Agate (with Amethyst Geode center)

Silicon Dioxide (SiO2) - Cryptocrystalline Chalcedony

Hardness: 6.5-7 (Mohs); Color: Pale blue with white or darker blue concentric banding; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.64

Hardness: 6
Color: Pale blue with white or darker blue concentric banding
Luster: Waxy to vitreous

Identified March 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich groundwater in volcanic rock cavities (vesicles). This specimen likely dates from the Cretaceous period, often found in amygdaloidal basalt environments where layers of chalcedony fill the void over millions of years.

Uses & applications

Primarily used as a decorative lapidary material, in jewelry (cabochons and beads), and as a popular specimen for metaphysical or mineral collectors.

Geological facts

The 'lace' refers to the delicate, wavy banding pattern. This specific specimen is carved into a 'druzy sphere,' showcasing a central cavity of macrocrystalline quartz (amethyst) that didn't fully fill the original gas bubble.

Field identification & locations

Identify by its distinct soft blue banding and translucent quality. It is almost exclusively mined in Namibia and South Africa. Collectors look for deep color saturation and undamaged central crystal pockets (geode centers).

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