sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Vitreous to dull, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None, Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Vitreous to dull, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None, Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica in sedimentary environments or hydrothermal veins, where iron oxide inclusions provide the distinct red coloration. Found in ancient volcanic deposits and sedimentary beds.
Uses & applications
Widely used as a gemstone for jewelry, carvings, ornaments, and pocket stones. Historically used for making tools and seals.
Geological facts
Red Jasper has been a sacred stone across many cultures; it was known as the 'rain-bringer' in some Native American traditions and was used in the breastplate of the High Priest in Biblical times.
Field identification & locations
Identify by its opaque red color and high hardness (it will scratch glass). Commonly found in riverbeds or coastal areas in India, Brazil, USA, and South Africa.
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