sedimentary
Jasper and Ironstone (likely Jasperized Ironstone)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
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
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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.
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