sedimentary

Mixed River Stones and Agates

Mixed Silicates and Ironstones (primarily SiO2 and Fe2O3)

AI-generated identification · may be incorrect

Hardness: 6.5-7.0 (Mohs). Colors: Brown, dark grey, reddish-orange, and yellow. Luster: Dull, waxy, to sub-vitreous. Cleavage: None (conchoidal fracture). Texture: Water-worn, rounded to sub-angular.

Hardness: 6
Luster: Dull, waxy, to sub-vitreous

Identified July 5, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7.0 (Mohs). Colors: Brown, dark grey, reddish-orange, and yellow. Luster: Dull, waxy, to sub-vitreous. Cleavage: None (conchoidal fracture). Texture: Water-worn, rounded to sub-angular.

Formation & geological history

Formed through secondary deposition in fluvial (river) environments. Many pieces are cryptocrystalline quartz (agate/jasper) or iron-rich sedimentary rocks that have been smoothed by water transport during the Holocene or Pleistocene.

Uses & applications

Primarily for lapidary use (tumbling), decorative landscaping, or as entry-level collection specimens.

Geological facts

The reddish-brown pieces likely contain Limonite or Hematite. The smoother, waxy stones are typical of alluvial agates which are hardy enough to survive long-distance river transport without shattering.

Field identification & locations

Identify in the field by looking for 'river polish'—naturally smoothed surfaces in streambeds. Agates can be identified by their translucency when held to light. Common in glacial till and active river basins.