sedimentary

Jasper and Ironstone (likely Jasperized Ironstone)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Rusty orange, yellow-brown, and earthy green; Luster: Dull to waxy; Crystal Structure: Microcrystalline; Specific Gravity: 2.6-2.9.

Hardness: 6
Color: Rusty orange, yellow-brown, and earthy green
Luster: Dull to waxy

Identified March 29, 2026More sedimentary →

Explore Jasper and Ironstone (likely Jasperized Ironstone) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6.5-7 (Mohs scale), Color: Rusty orange, yellow-brown, and earthy green; Luster: Dull to waxy; Crystal Structure: Microcrystalline; Specific Gravity: 2.6-2.9.

Formation & geological history

Formed through the process of silicification, where silica-rich fluids permeate sedimentary iron deposits, often during the Proterozoic or Paleozoic eras. Found in iron-rich sedimentary basins and hydrothermal environments.

Uses & applications

Commonly used for lapidary work (cabochons), as an ornamental stone, or in landscape architecture. Historically used for making tools due to its conchoidal fracture.

Geological facts

Jasper’s color is almost always determined by its iron content; the rusty orange hues in this specimen are caused by goethite or hematite. It is often referred to as a 'nurturing stone' in metaphysical circles.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), opaque nature, and earthy, iron-stained crust. Commonly found in riverbeds or near iron mining districts in Australia, USA (Lake Superior), and Brazil.