sedimentary

Red Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Hardness: 6.5 to 7 on the Mohs scale; Color: Red to reddish-brown due to iron inclusions; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None, exhibits conchoidal fracture; Specific gravity: 2.58 to 2.91

Hardness: 6
Color: Red to reddish-brown due to iron inclusions
Luster: Vitreous to dull

Identified August 6, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the hydrothermal deposition of silica-rich fluids or the accumulation of silica-rich radiolarian ooze on ocean floors, often occurring within sedimentary or volcanic environments over millions of years.

Uses & applications

Used primarily in lapidary work, making cabochons, beads, small carvings, ornamental objects, and as a semi-precious gemstone.

Geological facts

Red jasper has been used since ancient times for talismans, seals, and jewelry. The ancient Egyptians carved amulets from it, associating the stone with the blood of the goddess Isis.

Field identification & locations

Can be identified in the field by its opaque red color, waxy-to-dull luster, and high hardness (scratches glass). It is commonly found in riverbeds, glacial tills, and areas with ancient marine or volcanic deposits.

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