sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
Hardness: 6.5–7 on Mohs scale. Color: Opaque terracotta red to brownish-red. Luster: Dull to vitreous (glossy) when polished. Crystal structure: Trigonal/Microcrystalline. Cleavage: None (conchoidal fracture). Specific Gravity: 2.58–2.91.
- Hardness
- 6
- Color
- Opaque terracotta red to brownish-red
- Luster
- Dull to vitreous (glossy) when polished
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Physical properties
Hardness: 6.5–7 on Mohs scale. Color: Opaque terracotta red to brownish-red. Luster: Dull to vitreous (glossy) when polished. Crystal structure: Trigonal/Microcrystalline. Cleavage: None (conchoidal fracture). Specific Gravity: 2.58–2.91.
Formation & geological history
Formed through the deposition of silica-rich sediments or volcanic ash. Over millions of years, heat and pressure silica-saturate the substrate, while iron oxides (hematite) leech into the mineral to provide the deep red pigmentation. It can be found in sedimentary beds dating back to the Precambrian era.
Uses & applications
Primarily used for lapidary work, jewelry (cabochons and beads), ornamental or decorative carvings, and in the 'metaphysical' market as a grounding stone.
Geological facts
Jasper was a favorite gem in the ancient world; its name can be traced back in Hebrew, Assyrian, Persian, Greek, and Latin. Red Jasper is specifically mentioned in many ancient texts as a stone of protection and physical vitality.
Field identification & locations
Identify by its solid red color, inability to be scratched by a steel knife, and smooth, waxy feel when tumbled. Unlike Carnelian, Red Jasper is completely opaque. It is commonly found in India, Brazil, Madagascar, and the Southwestern USA.
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