sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (Microcrystalline); Cleavage: None (Conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish-red
- 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); Color: Brick red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (Microcrystalline); Cleavage: None (Conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Forms when silica-rich fluids permeate through volcanic ash or sedimentary deposits. The red color is caused by the inclusion of iron oxide (hematite) during the mineralization process.
Uses & applications
Widely used in jewelry making (cabochons, beads), decorative carvings, and as a popular stone for collectors and metaphysical practitioners.
Geological facts
Jasper has been used as a gemstone since antiquity; it was mentioned in the Bible and utilized by ancient Egyptians in amulets and seals. It is a variety of chalcedony.
Field identification & locations
Identify by its opaque quality, smooth waxy feel when polished, and deep red color that does not scratch easily with a steel knife. Commonly found in Brazil, India, USA, and South Africa.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Sandstone (Quartz-rich)
Arenite (SiO2)
sedimentary
Sandstone (with man-made markings)
Arenite (composed primarily of Quartz, SiO2)
sedimentary