sedimentary
Red Jasper
Jasper (Silica with Hematite inclusions), SiO2
Hardness: 6.5-7 (Mohs); Color: Deep red to reddish-brown; Luster: Dull to vitreous; Crystal Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep red to reddish-brown
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Deep red to reddish-brown; Luster: Dull to vitreous; Crystal Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments. Its red color is derived from high iron content (hematite) during formation. It can range in age from millions to billions of years old.
Uses & applications
Used widely in lapidary for cabochons, beads, and carvings. Historically used for seals and amulets. Also used as an ornamental stone in interior design and for tumbled decorative aggregate.
Geological facts
Ancient Egyptians associated red jasper with the blood of Isis and used it for protective amulets. It is considered a variety of chalcedony and often occurs in localized pockets or veins within larger rock formations.
Field identification & locations
Identify in the field by its opaque nature (it does not transmit light even on thin edges), its deep red color, and its smooth, shell-like (conchoidal) fracture pattern. Often found in riverbeds and desert environments.
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