sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
Hardness: 6.5-7 (Mohs); Color: Deep brick red to brownish-red; Luster: Vitreous to dull; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.6-2.9.
- Hardness
- 6
- Color
- Deep brick red to brownish-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Deep brick red to brownish-red; Luster: Vitreous to dull; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.6-2.9.
Formation & geological history
Formed from the deposition of silica-rich fluids in volcanic or sedimentary environments, often associated with Banded Iron Formations (BIFs). The red color is caused by iron (hematite) impurities. It can range from Precambrian to modern in age.
Uses & applications
Primarily used as a gemstone for jewelry (cabochons, beads), decorative carvings, lapidary art, and metaphysical purposes. Historically used for seals and tool making.
Geological facts
Red Jasper has been used by humans for thousands of years; it was a sacred stone in ancient Egypt often carved into protective amulets. It is an opaque variety of chalcedony.
Field identification & locations
Identify by its rich red color, opacity (it does not let light through even at thin edges), and inability to be scratched by a steel knife. Found globally, with major deposits in India, Brazil, South Africa, and the USA.
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