mineral

Agate (Lace Agate Geode Slice)

Silicon Dioxide (SiO2)

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

Hardness: 6
Color: Grey, lavender, blue, and brown with wavy banding
Luster: Vitreous to waxy

Identified April 29, 2026More mineral →

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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.

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Nephrite Jade

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Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Green Apatite on Albite

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mineral