sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
Hardness: 6.5-7 (Mohs scale), Color: Brownish-red to earthy tones, Luster: Dull or waxy, Crystal Structure: Cryptocrystalline, Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Brownish-red to earthy tones, Luster: Dull or waxy, Crystal Structure: Cryptocrystalline, Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica-rich solutions into sedimentary rocks or volcanic ash, often associated with iron oxides that provide the characteristic coloring through oxidation.
Uses & applications
Commonly used for lapidary work, jewelry (cabochons), ornamental stone carivngs, and as a decorative landscaping rock.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning spotted stone. It has been used by ancient civilizations for seals and talismans for thousands of years.
Field identification & locations
Identify by its hardness (will scratch glass), opaque nature even on thin edges, and smooth, rounded exterior often found in riverbeds or coastal environments.
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