sedimentary

Riverstone Jasper

Silicon Dioxide (SiO2) with iron/clay inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs; Color: Olive green with brown crust; Luster: Waxy to dull; Structure: Microcrystalline; Cleavage: None (Conchoidal fracture)

Hardness: 6
Color: Olive green with brown crust
Luster: Waxy to dull

Identified July 17, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Olive green with brown crust; Luster: Waxy to dull; Structure: Microcrystalline; Cleavage: None (Conchoidal fracture)

Formation & geological history

Formed from silica-rich fluids permeating volcanic ash or sedimentary beds, followed by mechanical weathering in a river environment during the Holocene to Pleistocene epochs.

Uses & applications

Used primarily for lapidary work, jewelry making (cabochons), aquarium decor, and as decorative landscaping gravel.

Geological facts

Jasper is an opaque variety of chalcedony. The smooth, rounded shape of this specimen indicates it has spent significant time being tumbled by water currents in a stream or river bed.

Field identification & locations

Commonly identified by its smooth, water-worn exterior and waxy appearance. Can be found in riverbeds globally, especially in areas with basaltic or sedimentary history.