mineral
Red Jasper
SiO2, Chalcedony with iron inclusions
AI-generated identification · may be incorrectHardness: 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
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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.
