sedimentary
Red Jasper
Silicon Dioxide (SiO2)
Hardness: 6.5–7 on the Mohs scale; Color: Red to brownish-red due to iron inclusions; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline quartz); Cleavage: None/Conchoidal fracture; Specific gravity: 2.6–2.9.
- Hardness
- 6
- Color
- Red to brownish-red due to iron inclusions
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5–7 on the Mohs scale; Color: Red to brownish-red due to iron inclusions; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline quartz); Cleavage: None/Conchoidal fracture; Specific gravity: 2.6–2.9.
Formation & geological history
Formed through the infiltration of silica-rich hydrothermal fluids into volcanic ash or fine-grained sediments, often occurring in volcanic or sedimentary environments across many geological ages.
Uses & applications
Commonly used for lapidary work, jewelry (beads, cabochons), ornamental vases, and as a popular 'healing' stone in holistic health communities.
Geological facts
Jasper is an opaque variety of chalcedony. Historically, it was known as the 'Supreme Nurturer' and has been used in amulets and seals ancient Egypt and Mesopotamia.
Field identification & locations
Identify in the field by its opaque nature (even on thin edges), its smooth conchoidal fracture, and the fact it cannot be scratched by a steel knife. Commonly found in riverbeds or gravel deposits in areas with volcanic history.
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