mineral

Banded Agate (Lace Agate)

Agate (Variety of Cryptocrystalline Quartz), SiO2

Hardness: 6.5-7 (Mohs scale); Color: Brown, white, grey, and cream bands; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.60-2.65

Hardness: 6
Color: Brown, white, grey, and cream bands
Luster: Waxy to vitreous

Identified April 4, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Brown, white, grey, and cream bands; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.60-2.65

Formation & geological history

Formed in cavities of volcanic rocks (basalt or andesite) or metamorphic rocks where silica-rich groundwater precipitates in layers over time. The concentric banding reflects changes in fluid chemistry during deposition.

Uses & applications

Commonly used in jewelry (cabochons, beads), decorative ornaments, lucky charms, and industrial uses like mortar and pestles due to its hardness and chemical resistance.

Geological facts

Agate is one of the oldest healing stones in history, dating back to Ancient Greece. The bands can be so thin that it takes roughly 15,000 layers to make one inch of thickness.

Field identification & locations

Identified by its distinctive concentric or 'lacey' banding and translucent quality. In the field, it is often found as nodules with a rough, weathered exterior and is commonly found in riverbeds or volcanic regions like Brazil, Mexico, and the USA.

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