sedimentary

Red Jasper (Polished)

Silicon Dioxide (SiO2) with Hematite inclusions

Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red with grey/white quartz veins; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red to brownish-red with grey/white quartz veins
Luster: Vitreous to waxy

Identified May 9, 2026More sedimentary →

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Physical properties

Formation & geological history

Red jasper is a microcrystalline variety of quartz. It forms when silica-rich fluids permeate through volcanic ash or sedimentary rocks, with the red color provided by iron oxide (hematite) inclusions. Many deposits date back to the Precambrian or Paleozoic eras.

Uses & applications

Primarily used for lapidary work, jewelry (cabochons and beads), ornamental stone carvings, and as a popular collector's 'pocket stone'.

Geological facts

The name Jasper comes from the Greek word 'iaspis', meaning 'spotted stone'. It was prized in the ancient world for its supposed protective qualities and was frequently used for seals and amulets in Mesopotamia and Egypt.

Field identification & locations

Identify in the field by its opaque nature (even on thin edges), its smooth conchoidal fracture, and its inability to be scratched by a steel knife. It is commonly found in India, Brazil, France, Germany, and the USA.

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