sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red; Luster: Vitreous to waxy; Crystal Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red; Luster: Vitreous to waxy; Crystal Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed from the deposition of silica from water or volcanic ash, which later crystallizes into a dense, opaque variety of chalcedony. The red color is caused by the presence of iron oxide (hematite). Found in sedimentary or metamorphic layers.
Uses & applications
Used widely in lapidary work, jewelry (beads, cabochons), ornamental carvings, and as a popular specimen for crystal healing collecting.
Geological facts
Jasper has been used as a gemstone for thousands of years; it was a favorite in the ancient world for seals and talismans. It is an opaque variety of chalcedony.
Field identification & locations
Identify by its deep red color, opacity (light does not pass through), and smooth, shell-like fracture pattern. Commonly found in riverbeds or near volcanic deposits in locations like USA, Brazil, and India.
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