sedimentary

Jasper (Red)

Silicon Dioxide (SiO2)

Hardness: 6.5–7 (Mohs scale); Color: Deep red to brownish red due to iron inclusions; Luster: Vitreous to greasy; Crystal structure: Microcrystalline/Cryptocrystalline; Cleavage: None (Conchoidal fracture); Specific gravity: 2.58–2.91.

Hardness: 6
Color: Deep red to brownish red due to iron inclusions
Luster: Vitreous to greasy

Identified March 25, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water or volcanic ash in sedimentary environments or hydrothermal veins. The red color is caused by impurities of hematite (iron oxide). It can be found in rocks dating from the Precambrian era to the present.

Uses & applications

Extensively used in lapidary work for cabochons, beads, and carvings. It is also used in construction for decorative stones, in industry as grinding media, and as a popular semi-precious gemstone for collectors.

Geological facts

Jasper was a favorite gem in the ancient world; its name can be traced back to Greek, Latin, and Hebrew. It is often referred to as the 'Supreme Nurturer' in metaphysical circles. Famous deposits are located in the Western United States, India, and Brazil.

Field identification & locations

Identify in the field by its opacity (it does not transmit light even on thin edges), its smooth conchoidal fracture, and its ability to scratch glass. It is commonly found in river beds or as nodules in volcanic rock. Collectors should look for uniform color and lack of fractures.