mineral

Red Jasper

Chalcedony/Quartz (SiO2) with iron inclusions

Hardness: 6.5–7 on Mohs scale; Color: Dull 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: Dull red to brownish-red
Luster: Vitreous to dull

Identified June 8, 2026More mineral →

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Physical properties

Formation & geological history

Jasper is a microcrystalline variety of quartz that forms when silica-rich fluids permeate porous volcanic or sedimentary rocks. The red coloring comes from high iron oxide (hematite) content during its formation, which typically occurs in hydrothermal environments or where volcanic ash is deposited.

Uses & applications

Commonly used as a gemstone in jewelry (cabochons, beads), decorative carvings, pocket stones, and industrial use in high-end abrasives due to its hardness and durability.

Geological facts

Red Jasper has been used since antiquity; it was known as the 'rain bringer' in some Native American cultures and was frequently used in the ancient world for cylinder seals and amulets. It is an opaque variety of chalcedony.

Field identification & locations

Identify by its deep red color, opacity (it will not let light through even at thin edges), and its glass-like conchoidal fracture if broken. It is a common find in river beds, deserts, and areas with old volcanic activity.

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Arenite (SiO2 based)

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