sedimentary
Jasper (Red/Brown Variety)
Jasper (Silicon Dioxide, SiO2 plus Iron Oxide impurities)
Hardness: 6.5-7 on Mohs scale. Color: Opaque reddish-brown. Luster: Dull to waxy. Structure: Microcrystalline quartz (Trigonal). Specific gravity: 2.6-2.9.
- Hardness
- 6
- Color
- Opaque reddish-brown
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Opaque reddish-brown. Luster: Dull to waxy. Structure: Microcrystalline quartz (Trigonal). Specific gravity: 2.6-2.9.
Formation & geological history
Formed through the accumulation of silica-rich fluids in volcanic ash or sedimentary layers. The mineral undergoes silicification over millions of years, often in environments with high iron content which provides the coloration.
Uses & applications
Commonly used for lapidary work, cabochons for jewelry, ornamental stone carvings, and as a decorative landscaping rock. Also used as a grounding stone in metaphysical practices.
Geological facts
Jasper is a variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone.' Many cultures historically believed jasper could ward off evil spirits and protect the bearer during travel.
Field identification & locations
Identify in the field by its opacity (does not let light through even at thin edges), smooth conchoidal fracture (curved breaks), and hardness (cannot be scratched by a steel knife). Commonly found in riverbeds and arid regions globally.
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