sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 (Mohs scale); Color: Brick red with occasional quartz veining; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red with occasional quartz veining
- Luster
- Vitreous to dull
Identified More sedimentary →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red with occasional quartz veining; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed via the deposition of silica from water into subterranean cavities or during the metamorphism of organic-rich sediments or volcanic ash. The red color is caused by iron (hematite) inclusions incorporated during the solidification process.
Uses & applications
Commonly used as a gemstone for jewelry, in lapidary work for cabochons and tumbled stones, and as decorative architectural accents or stone carvings.
Geological facts
Red Jasper has been used since antiquity as a 'warrior's stone' for protection. It is a dense, opaque variety of chalcedony that is valued for its deep, rich color and ability to take a high polish.
Field identification & locations
Identifiable in the field by its opacity (unlike translucent carnelian), lack of cleavage, and resistance to scratching steel. Often found in riverbeds, desert pavements, and near iron-rich volcanic deposits.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite (primarily SiO2)
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
sedimentary