sedimentary
Red Jasper
Jasper (Silica with Hematite impurities), SiO2
Hardness: 6.5-7 (Mohs); Color: Deep red to brownish-red; Luster: Dull to vitreous; Structure: Microcrystalline (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep red to brownish-red
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Deep red to brownish-red; Luster: Dull to vitreous; Structure: Microcrystalline (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the settlement of hydrothermal fluids or in sedimentary deposits where silica-rich fluids permeate microcrystalline quartz and iron oxide (Hematite), predominantly during various geological eras from the Precambrian onwards.
Uses & applications
Used extensively in jewelry as cabochons or beads, ornamental decor, lapidary art, and historically used for stone tools and seals.
Geological facts
Jasper is an opaque variety of chalcedony. The red color specifically comes from high concentrations of iron inclusions. Historically, it was known as the 'supreme nurturer' and was worn by ancient Egyptian pharaohs for protection.
Field identification & locations
Identify by its opaque nature (light will not pass through edges), smooth conchoidal fracture, and inability to be scratched by a steel knife. Frequently found in riverbeds or coastal areas as rounded cobbles.
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