sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7.0 (Mohs scale), Color: brick-red to deep brown-red, Luster: dull to vitreous, Crystal Structure: hexagonal (trigonal), Cleavage: none, Specific Gravity: 2.58-2.91
- Hardness
- 6
Identified More sedimentary →
Explore Red Jasper in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5-7.0 (Mohs scale), Color: brick-red to deep brown-red, Luster: dull to vitreous, Crystal Structure: hexagonal (trigonal), Cleavage: none, Specific Gravity: 2.58-2.91
Formation & geological history
Formed primarily as a result of the replacement of fine-grained sediment or volcanic ash by silica-rich hydrothermal fluids. The red color comes from high concentrations of hematite (iron oxide). It is often found in sedimentary layers or volcanic vein deposits.
Uses & applications
Used extensively for lapidary work, including cabochons, beads, and carvings. Historically used for seals and decorative objects. Highly valued by collectors of metaphysical stones.
Geological facts
Known as the 'Stone of Endurance' in ancient cultures, it was often used in amulets for protection. It is a microcrystalline variety of quartz and is almost entirely opaque compared to other chalcedonies.
Field identification & locations
Identify by its characteristic dull, waxy, or earthy texture before polishing and its opaque nature. Unlike red glass, it will not have air bubbles. Commonly found in South Africa, Brazil, India, and across the USA (especially Oregon and Utah).
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary