sedimentary

Red Jasper (possibly Brecciated)

Jasper (Silicon Dioxide, SiO2)

Hardness: 6.5–7 (Mohs scale); Color: Brick red with possible hematite or clay inclusions; Luster: Dull/Waxy; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91

Hardness: 6
Color: Brick red with possible hematite or clay inclusions
Luster: Dull/Waxy

Identified March 20, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the deposition of silica-rich fluids in volcanic ash or sedimentary beds. The red color is derived from iron (hematite) inclusions within the cryptocrystalline quartz structure. Can date from various geological periods, often associated with Precambrian formations.

Uses & applications

Commonly used in lapidary for cabochons, beads, and carvings; historical use in jewelry and amulets; industrial use as an ornamental stone or in decorative gravel.

Geological facts

Jasper was a favorite gem in the ancient world, frequently mentioned in biblical texts and used by early civilizations for seals and talismans. Its name is derived from the Greek 'iaspis', meaning 'spotted stone'.

Field identification & locations

Identify in the field by its opacity (unlike translucent carnelian), smoothness, and inability to be scratched by a steel blade. Commonly found in riverbeds, gravel pits, and desert regions globally (notably India, Egypt, and the USA).

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