sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron inclusions
Hardness: 6.5–7 (Mohs scale); Color: Deep brick red; Luster: Dull to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.6–2.9
- Hardness
- 6
- Color
- Deep brick red
- Luster
- Dull to waxy
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: Deep brick red; Luster: Dull to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.6–2.9
Formation & geological history
Formed through the accumulation of fine silica sediment and volcanic ash, often in hydrothermal or sedimentary environments. It takes on its red color from high iron content. These specimens can range from millions to billions of years old.
Uses & applications
Predominantly used as continuous decorative stone, in lapidary work for jewelry (cabochons), as metaphysical 'healing' stones, and historically for tools requiring a sharp, durable edge.
Geological facts
Red Jasper was traditionally known as the 'stone of endurance.' It is a member of the chalcedony family, meaning its quartz crystals are so small they can only be seen under high magnification.
Field identification & locations
Identify it by its opacity (unlike translucent carnelian), its high hardness (it will scratch glass), and its lack of visible grains. Commonly found in stream beds and beaches in volcanic regions.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone
Arenite
sedimentary