sedimentary
Jasper (Red-Brown Variety)
Microcrystalline Quartz (SiO2) with high Iron Oxide content
Hardness: 6.5-7 Mohs; Color: Earthy red-brown with white veinlets; Luster: Dull to waxy; Structure: Microcrystalline; Specific Gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Earthy red-brown with white veinlets
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Earthy red-brown with white veinlets; Luster: Dull to waxy; Structure: Microcrystalline; Specific Gravity: 2.58-2.91.
Formation & geological history
Formed primarily in sedimentary environments where silica-rich fluids permeate through layers of volcanic ash or mud. The red-brown color comes from the inclusion of iron oxides (hematite/goethite).
Uses & applications
Commonly used as a decorative stone, for cabochons in jewelry, pocket stones for metaphysical healing, and as a gemstone for lapidary work.
Geological facts
The name 'Jasper' originates from the Greek 'iaspis', meaning 'spotted stone'. In ancient cultures, it was known as the 'supreme nurturer' and was widely used for seal stones.
Field identification & locations
Identify by its smooth, opaque surface and hardness (it will scratch glass). Often found in riverbeds or coastal areas as water-worn pebbles. Common in the Western US and India.
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