sedimentary/mineral
Red Jasper (River Polished)
Jasper (Silicon Dioxide, SiO2)
Hardness: 6.5–7 (Mohs scale). Color: Opaque deep red due to iron inclusion (Hematite). Luster: Dull to vitreous (waxy when polished). Crystal structure: Trigonal/Microcrystalline. Specific gravity: 2.58–2.91.
- Hardness
- 6
- Color
- Opaque deep red due to iron inclusion (Hematite)
- Luster
- Dull to vitreous (waxy when polished)
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Physical properties
Hardness: 6.5–7 (Mohs scale). Color: Opaque deep red due to iron inclusion (Hematite). Luster: Dull to vitreous (waxy when polished). Crystal structure: Trigonal/Microcrystalline. Specific gravity: 2.58–2.91.
Formation & geological history
Formed from the deposition of silica-rich fluids in volcanic ash or sedimentary environments. The red coloration is a result of iron impurities. This specimen appears water-worn or river-tumbled, a process occurring over thousands of years as the stone is eroded by moving water.
Uses & applications
Commonly used for lapidary work, cabochons for jewelry, decorative ornaments, and metaphysical collection. Historically used for making tools and seals.
Geological facts
Jasper was a favorite gem in antiquity and is mentioned in various historical texts including the Bible. It is known as the 'supreme nurturer' in gemstone folklore. The name comes from the Greek word 'iaspis', meaning spotted stone.
Field identification & locations
Identify by its rich red color, extreme hardness (it will scratch glass), and its lack of transparency (it is totally opaque even at the edges). Commonly found in riverbeds, gravel pits, and coastal areas globally, particularly in areas with ancient volcanic activity.
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