sedimentary
Red Jasper (Ferruginous Chert)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 6.5-7 on Mohs scale. Color: Opaque brick red to brownish red. Luster: Vitreous to dull. Crystal Structure: Hexagonal (microcrystalline). Fracture: Conchoidal to splintery.
- Hardness
- 6
- Color
- Opaque brick red to brownish red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Opaque brick red to brownish red. Luster: Vitreous to dull. Crystal Structure: Hexagonal (microcrystalline). Fracture: Conchoidal to splintery.
Formation & geological history
Formed through the infiltration of silica-rich solutions into volcanic rocks or sedimentary deposits, where iron oxide (hematite) provides the red coloration. Often found in Precambrian formations.
Uses & applications
Used primarily as an ornamental stone, for lapidary work (cabochons), jewelry, and as a healing stone in metaphysical communities. Historically used for making tools due to its sharp fracture edges.
Geological facts
Jasper has been a favorite gem in the ancient world; its name can be traced back in Arabic, Persian, Greek, and Latin. It is a dense, impure variety of silica.
Field identification & locations
Identify by its waxy to dull luster, lack of transparency (even on thin edges), and red streak on a streak plate. Commonly found in riverbeds and arid regions with volcanic history.
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