sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Hardness: 6.5-7 on Mohs scale; Color: Brick red to brownish red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Color: Brick red to brownish red
Luster: Vitreous to dull

Identified July 9, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms when silica-rich fluids permeate through volcanic ash or sedimentary deposits. The red color is derived from high inclusions of iron oxide (hematite). It typically forms in hydrothermal veins or as nodules in sedimentary rocks.

Uses & applications

Used primarily for lapidary purposes, including cabochons, beads, and carvings. Historically used for seals and amulets. Also used in aggregate for landscaping.

Geological facts

Jasper was a favorite gem in the ancient world; its name can be traced back to Arabic, Persian, Greek, and Latin. It is known as the 'supreme nurturer' in metaphysical circles.

Field identification & locations

Identify by its opaque nature (even on thin edges), its characteristic deep red color, and its smoothness when water-worn. Common in riverbeds and coastal regions worldwide, particularly in India, Russia, Brazil, and the USA.

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Chert Breccia

Brecciated Chert (Microcrystalline Silica)

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