sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron inclusions
Hardness: 6.5–7 (Mohs). Color: Opaque brick red to deep brownish-red. Luster: Dull to waxy. Crystal Structure: Trigonal (Microcrystalline). Cleavage: None. Specific Gravity: 2.58–2.91.
- Hardness
- 6
- Color
- Opaque brick red to deep brownish-red
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5–7 (Mohs). Color: Opaque brick red to deep brownish-red. Luster: Dull to waxy. Crystal Structure: Trigonal (Microcrystalline). Cleavage: None. Specific Gravity: 2.58–2.91.
Formation & geological history
Formed in hydrothermal environments or through the deposition of silica from volcanic ash or water into cracks and cavities. Its red color comes from high concentrations of iron oxide (hematite). It can be found in strata ranging from Precambrian to more recent times.
Uses & applications
Predominantly used as a gemstone for jewelry (cabochons, beads), decorative carvings, lapidary art, and as a polishing stone. In ancient times, it was used for seals and amulets.
Geological facts
Red Jasper has been known since antiquity as a 'warrior's stone.' It was cited in many ancient cultures as a stone of protection and was even mentioned in the Bible in the context of the high priest's breastplate.
Field identification & locations
Identify by its opaque red color, smooth waxy texture when tumbled, and its inability to be scratched by a steel knife. It is commonly found in riverbeds or coastal areas in India, Brazil, the USA, and South Africa.
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