sedimentary

Red Jasper

Opaque microcrystalline Quartz (SiO2 with Fe2O3 inclusions)

Hardness: 6.5-7 on Mohs scale; Color: Terracotta red to brownish-red; Luster: Vitreous to waxy (when polished); Crystal Structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58-2.91.

Hardness: 6
Color: Terracotta red to brownish-red
Luster: Vitreous to waxy (when polished)

Identified May 27, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when silica-rich fluids permeate through volcanic ash or sedimentary deposits, and the iron oxide (hematite) provides the red pigmentation. It can be found in a wide variety of geological ages and typically forms in hydrothermal environments or as a secondary mineral in nodules.

Uses & applications

Commonly used as a gemstone for jewelry (cabochons, beads), decorative carvings, lapidary art, and industrially as an abrasive in some contexts. It is also a popular healing stone in metaphysical circles.

Geological facts

Red Jasper is known as the 'Stone of Endurance' and has been used since antiquity for talismans and seal stones in many cultures, including Ancient Egypt and Babylon.

Field identification & locations

Identify in the field by its distinctive opaque red color, high hardness (cannot be scratched by a steel knife), and smooth, often water-worn tumbled appearance. It is commonly found in gravel pits, riverbeds, and as nodules in volcanic rock throughout the US, Brazil, and India.

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Sandstone Grain

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Sandstone

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Chert Breccia

Brecciated Chert (Microcrystalline Silica)

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