sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 Mohs; Color: Opaque brick red; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None (conchoidal fracture)
- Hardness
- 6
- Color
- Opaque brick red
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Opaque brick red; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None (conchoidal fracture)
Formation & geological history
Formed when fine particulate materials, often volcanic ash or silica-rich water, are cemented together. Its red color comes from high iron content. It is typically found in sedimentary deposits or as secondary fillings in volcanic rocks.
Uses & applications
Commonly used as a gemstone for jewelry, ornamental carvings, pocket stones, and decorative lapidary work. It is also a popular stone for collectors and spiritual practitioners.
Geological facts
Red Jasper has been used by humans for thousands of years; it was referred to as the 'warrior's stone' in ancient times and was often used to decorate sword hilts and jewelry in ancient Egypt and Mesopotamia.
Field identification & locations
Identify by its deep red, opaque color and smooth, dull-to-waxy finish when tumbled. It is found globally, with significant deposits in India, Brazil, Madagascar, and the United States.
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