sedimentary
Red Jasper
Silicon Dioxide with Iron inclusions (SiO2)
Hardness: 6.5-7 on Mohs scale; Color: Red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Red to brownish-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from water-rich environments, often in hydrothermal veins or as nodules in volcanic rocks. Its red color is derived from high iron content during its formation process over millions of years.
Uses & applications
Commonly used in jewelry (cabochons, beads), decorative carvings, lapidary arts, and as a popular gemstone for collectors and metaphysical enthusiasts.
Geological facts
Jasper has been used as a gemstone since antiquity; it was mentioned in the Bible and utilized by ancient civilizations for seals and talismans. It is a variety of chalcedony.
Field identification & locations
Identify in the field by its waxy luster when broken, conchoidal fracture, and inability to be scratched by a steel knife. It is frequently found in riverbeds or coastal areas in India, Brazil, and the USA.
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