sedimentary

Wonderstone (Sandstone)

Silicified Quartz Sandstone with Iron Oxide staining

Hardness: 6-7 on Mohs scale; Color: Tan, cream, pink, and burgundy bands; Luster: Dull to earthy; Crystal Structure: Microcrystalline (grains bonded by silica); Cleavage: None; Specific Gravity: Approx 2.6

Hardness: 6-7 on Mohs scale
Color: Tan, cream, pink, and burgundy bands
Luster: Dull to earthy

Identified April 1, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed during the Eocene epoch as volcanic ash fell into water, or through the movement of mineral-rich groundwater through porous sandstone, depositing iron oxide (hematite and goethite) in concentric bands known as Liesegang rings.

Uses & applications

Primarily used for lapidary work, including cabochons, decorative sculptures, and as a popular collector specimen due to its unique aesthetic patterns.

Geological facts

The striking color bands are actually chemical precipitation patterns called Liesegang rings. Many famous deposits are found in Utah and Nevada, where volcanic activity provided the mineral-rich fluids necessary for its formation.

Field identification & locations

Identify in the field by its distinct colorful, rhythmic banding and its gritty, sandy texture. It is frequently found in arid, desert regions of the Western United States, particularly near Fallon, Nevada, or Kanab, Utah.

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