mineral

Red Jasper

SiO2, Chalcedony with iron inclusions

Hardness: 6.5-7, Color: Brick red to brownish red, Luster: Vitreous to dull, Crystal structure: Microcrystalline (trigonal), Cleavage: None, Specific gravity: 2.58-2.91

Hardness: 6

Identified July 17, 2026More mineral →

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Physical properties

Hardness: 6.5-7, Color: Brick red to brownish red, Luster: Vitreous to dull, Crystal structure: Microcrystalline (trigonal), Cleavage: None, Specific gravity: 2.58-2.91

Formation & geological history

Forms from the deposition of silica in sedimentary environments or hydrothermal veins, often getting its red color from iron(III) inclusions (hematite). Can be of various geological ages.

Uses & applications

Used in jewelry (especially cabochons, beads, and carved pendants), ornamental objects, and historical artifacts like seals and intaglios.

Geological facts

Red jasper was a favorite gem in the ancient world; its name can be traced back in Hebrew, Assyrian, Persian, Greek and Latin.

Field identification & locations

Identify by its opaque red color, hardness that can scratch glass, and lack of cleavage. Often found worldwide, varying in quality. It is widely collected as an affordable semi-precious stone.