Agate (Lace Agate Geode Slice)

Physical Properties

Hardness: 6.5-7 Mohs; Color: Grey, lavender, blue, and brown with wavy banding; Luster: Vitreous to waxy; Crystal Structure: Trigonal (Cryptocrystalline); Cleavage: None; SG: 2.58–2.64

Formation & Geological History

Formed in volcanic rock cavities (vesicles) where silica-rich groundwater deposited layers of chalcedony over time. Typically dates from the Cenozoic to Mesozoic eras depending on the host formation.

Uses & Applications

Used primarily for lapidary arts, jewelry, interior decor (coasters/slices), and as healing stones in metaphysical circles.

Geological Facts

This specimen displays a 'lace' pattern, characterized by intricate, swirling bands. Agates are unique in that no two slices from the same rock are exactly identical.

Field Identification & Locations

Look for microcrystalline quartz with concentric or wavy banding. This specific piece has a scalloped, shell-like edge often found in nodules/geodes. Commonly found in Mexico, Brazil, and the USA.

Identified on: 4/29/2026

Mode: Standard