Mineral

Lace Agate (specifically Red Lace Agate)

Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz

Hardness: 6.5-7 (Mohs scale); Color: Variegated red, white, gray, and brown with banded patterns; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.64.

Hardness: 6
Color: Variegated red, white, gray, and brown with banded patterns
Luster: Vitreous to waxy

Identified March 26, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica from groundwater in the cavities of igneous rocks, particularly volcanic lavas. Most specimens are found in Eocene or older volcanic formations where hydrothermal activity occurred.

Uses & applications

Primary use is in jewelry (cabochons, beads), decorative lapidary arts, and as a collector's mineral due to its unique banding patterns.

Geological facts

Agate is one of the oldest gemstones used in history; it was valued in ancient Greece for amulets. The specific 'lace' pattern is caused by rhythmic crystallization of silica over thousands of years.

Field identification & locations

Identify in the field by its distinct waxy luster, hardness (it will scratch glass), and the presence of parallel or 'lacey' curved banding in cross-section. Common locations include Mexico (Laguna Agate) and various parts of the Western United States.

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