sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Vitreous to waxy; Structure: Microcrystalline/cryptocrystalline; Cleavage: None (conchoidal fracture); Opaque.
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Vitreous to waxy; Structure: Microcrystalline/cryptocrystalline; Cleavage: None (conchoidal fracture); Opaque.
Formation & geological history
Formed primarily in sedimentary environments as silica-rich fluids permeate through volcanic ash or sedimentary beds, with Hematite providing the red coloration. Commonly found in Mesozoic to Cenozoic strata in the Southwestern US.
Uses & applications
Ornamental stone used for cabochons, jewelry, lapidary carvings, and metaphysical collecting.
Geological facts
Red Jasper has been used since antiquity as a 'warrior's stone.' It is a member of the Chalcedony family. The El Paso/Juarez region (31.7 N, 106.4 W) is part of the Rio Grande rift valley where cryptocrystalline silicates like jasper are extremely common in river gravels.
Field identification & locations
Identified by its deep red color, opacity (even on thin edges), and inability to be scratched by a steel knife. Frequently found in desert washes and alluvial deposits throughout the Chihuahuan Desert.
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