sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5–7 on the Mohs scale. Color: Brick-red to brownish-red. Luster: Dull to vitreous. Crystal Structure: Microcrystalline/Cryptocrystalline (Trigonal). Cleavage: None (Conchoidal fracture). Specific Gravity: 2.58–2.91.
- Hardness
- 6
- Color
- Brick-red to brownish-red
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5–7 on the Mohs scale. Color: Brick-red to brownish-red. Luster: Dull to vitreous. Crystal Structure: Microcrystalline/Cryptocrystalline (Trigonal). Cleavage: None (Conchoidal fracture). Specific Gravity: 2.58–2.91.
Formation & geological history
Formed through the accumulation of fine silica-rich sediments or volcanic ash that undergo lithification. The red coloring is caused by high concentrations of iron oxide (hematite) during formation. It can be found in various geological ages from Precambrian to Cenozoic.
Uses & applications
Commonly used in lapidary work for cabochons, beads, and carvings. Historically used for seals and amulets. It is also used in decorative construction and as a popular collector's stone for its grounding aesthetic.
Geological facts
In ancient times, Red Jasper was known as the 'Stone of Courage' and was often carried by warriors. It is one of the birthstones for the zodiac sign Aries and has been used in jewelry for thousands of years, dating back to Ancient Egypt and Crete.
Field identification & locations
Identify in the field by its opaque red color, high hardness (will scratch glass), and smooth, curved conchoidal fractures. It is commonly found in riverbeds, desert pavements, and iron-rich sedimentary deposits. Significant deposits are located in India, Brazil, South Africa, and the southwestern USA.
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