sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness (Mohs): 6.5-7; Color: Rusty red, brownish-red; Luster: Dull to vitreous; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None; Specific Gravity: 2.58-2.91
- Color
- Rusty red, brownish-red
- Luster
- Dull to vitreous
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Physical properties
Hardness (Mohs): 6.5-7; Color: Rusty red, brownish-red; Luster: Dull to vitreous; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica-rich fluids into sediment or volcanic ash, followed by silicification. Often found in proximity to ancient hydrothermal vents or in sedimentary beds where iron oxidation (hematite) provides the red pigment.
Uses & applications
Used widely in lapidary arts for making cabochons, beads, and ornamental carvings. It is also a popular collector's stone and used in landscaping.
Geological facts
Jasper is an opaque variety of chalcedony. The red variety has historically been known as a 'warrior stone,' believed to provide strength and courage. Many famous ancient seals and amulets were carved from red jasper.
Field identification & locations
Identify by its solid red color, high hardness (will scratch glass), and smooth, conchoidal fracture when broken. Found commonly in riverbeds and arid regions globally, notably in India, Brazil, and the Southwestern USA.
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