sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale), Color: Dull red to brownish red, Luster: Vitreous to greasy, Crystal structure: Trigonal (Microcrystalline), Cleavage: None (Conchoidal fracture), Specific Gravity: 2.58–2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Dull red to brownish red, Luster: Vitreous to greasy, Crystal structure: Trigonal (Microcrystalline), Cleavage: None (Conchoidal fracture), Specific Gravity: 2.58–2.91
Formation & geological history
Formed from the deposition of silica-rich sediments or volcanic ash where iron oxide (hematite) is present to give it its distinctive red color. These processes typically occur in ancient marine environments or as groundwater infiltrations in rock cavities.
Uses & applications
Commonly used in lapidary work for cabochons, beads, and pendants. Historically used for seals and amulets. Also used in construction as decorative aggregate for terrazzo and countertops.
Geological facts
Red Jasper has been known as the 'stone of endurance' throughout history. In ancient Egypt, it was often carved into amulets to protect the wearer and was associated with the blood of Isis.
Field identification & locations
Identify in the field by its opaque red color and high hardness (it will scratch glass). It is commonly found in India, Brazil, Madagascar, and the United States (western states). It often features small streaks of white quartz or black minerals.
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