sedimentary
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide impurities, SiO2 + Fe2O3)
Hardness: 6.5–7 on Mohs scale; Color: Terracotta red to brownish-red; Luster: Dull to vitreous (glassy); Crystal structure: Microcrystalline/Cryptocrystalline (Trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.91.
- Hardness
- 6
- Color
- Terracotta red to brownish-red
- Luster
- Dull to vitreous (glassy)
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Physical properties
Hardness: 6.5–7 on Mohs scale; Color: Terracotta red to brownish-red; Luster: Dull to vitreous (glassy); Crystal structure: Microcrystalline/Cryptocrystalline (Trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.91.
Formation & geological history
Formed through the deposition of silica from water-rich environments or hydrothermal activity. Its red color comes from high concentrations of iron oxide (hematite) during the sedimentation process. It is often found in prehistoric and ancient geological layers across many eras.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, and carvings. Historically used for seals and amulets. It is also used in decorative masonry and as a grounding stone in metaphysical practices.
Geological facts
Jasper was a favorite gem in the ancient world; its name can be traced back in Hebrew, Assyrian, Persian, Greek, and Latin. It is one of the birthstones for March and is known as the 'Supreme Nurturer' in folklore.
Field identification & locations
Identify by its opaque red color, smoothness when tumbled, and inability to be scratched by a steel knife. Commonly found in riverbeds, deserts, and volcanic regions such as the Western USA, Brazil, India, and South Africa.
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