sedimentary
Riverstone Jasper
Silicon Dioxide (SiO2) with impurities
Hardness: 6.5-7.0 (Mohs scale); Color: Earthy brown/green; Luster: Dull to waxy; Structure: Cryptocrystalline; Cleavage: None; Specific Gravity: 2.6-2.9
- Hardness
- 6
- Color
- Earthy brown/green
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7.0 (Mohs scale); Color: Earthy brown/green; Luster: Dull to waxy; Structure: Cryptocrystalline; Cleavage: None; Specific Gravity: 2.6-2.9
Formation & geological history
Formed from silica-rich fluids that permeated through sedimentary or volcanic environments, later shaped and smoothed into a rounded cobble by the abrasive action of water in a river or stream bed.
Uses & applications
Commonly used for lapidary work, decorative landscaping, aquarium stones, and as a pocket stone for grounding in metaphysical practices.
Geological facts
Jasper has been used as a tool-making material by ancient civilizations due to its durability and conchoidal fracture pattern. This specific specimen shows signs of natural stream-polishing.
Field identification & locations
Identify by its density, lack of visible crystals (cryptocrystalline), and smooth, water-worn exterior. Commonly found in riverbeds and glacial deposits worldwide.
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