sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2 with Iron oxide inclusions)
Hardness: 6.5-7 (Mohs); Color: Deep brick red to brownish red; Luster: Dull to vitreous; Crystal structure: Trigonal (Microcrystalline); Cleavage: None (Conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep brick red to brownish red
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Deep brick red to brownish red; Luster: Dull to vitreous; Crystal structure: Trigonal (Microcrystalline); Cleavage: None (Conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments. Over time, the silica crystallizes into microcrystalline quartz, with iron oxide (hematite) providing the red pigmentation.
Uses & applications
Used primarily in lapidary arts for jewelry, beads, bookends, and decorative carvings. Historically used for seals, talismans, and construction of ornamental accents.
Geological facts
Red Jasper was known as 'the blood of Mother Earth' in some ancient cultures. It has been used for thousands of years, including appearing in the breastplate of the High Priest in Biblical times.
Field identification & locations
Identify by its waxy-to-dull luster, red color that does not scratch easily (can scratch glass), and smooth, rounded water-worn surfaces if found in riverbeds. Common in many parts of the USA, Brazil, and India.
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