sedimentary

Red Jasper (Polished)

SiO2 (Silicon Dioxide) with Iron Oxide inclusions

Hardness: 6.5-7 (Mohs scale), Color: Rusty red, brown, or earthy orange, Luster: Vitreous to waxy (when polished), Crystal structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None, Specific gravity: 2.58-2.91

Hardness: 6

Identified July 9, 2026More sedimentary →

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Physical properties

Formation & geological history

Jasper is a microcrystalline variety of quartz that forms when silica-rich fluids permeate through volcanic or sedimentary rock, often acquiring its red color from iron oxide (hematite) impurities during the solidification process. It is found in deposits dating back to the Precambrian era.

Uses & applications

Commonly used for lapidary work, jewelry (beads, cabochons), metaphysical stones, home decor, and historically for seal stones and tools.

Geological facts

Red Jasper was known as the 'Stone of Endurance' in ancient times and was used by Egyptian priests to create amulets. It is an opaque form of chalcedony.

Field identification & locations

Identify in the field by its opacity (it does not let light through even at thin edges) and its smooth, conchoidal fracture. Commonly found in riverbeds or as nodules in desert environments across India, Brazil, and the USA.

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Brecciated Chert (Microcrystalline Silica)

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