sedimentary
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Deep brownish-red; Luster: Dull to waxy; Structure: Microcrystalline/Cryptocrystalline quartz; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep brownish-red
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Deep brownish-red; Luster: Dull to waxy; Structure: Microcrystalline/Cryptocrystalline quartz; 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 sediment, where iron oxides impart the red color during lithification.
Uses & applications
Widely used as a gemstone for jewelry, carvings, ornaments, and pocket stones. Also respected in spiritual and lapidary communities.
Geological facts
The name 'Jasper' is derived from the Greek word 'iaspis', meaning 'spotted stone'. It is historically known as a stone of endurance and was used in ancient times for seals and talismans.
Field identification & locations
Identify by its opaque red color and hardness (it should scratch glass but not be scratched by a steel knife). Commonly found in stream beds, beaches, and desert environments worldwide, particularly in India, Brazil, and the USA.
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