mineral
Jasper / Agate / Chalcedony
Cryptocrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness 6.5-7, waxy to dull luster, variable colors (red, orange, brown, dark grey/black in this specimen), massive crystal structure, conchoidal fracture.
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Physical properties
Hardness 6.5-7, waxy to dull luster, variable colors (red, orange, brown, dark grey/black in this specimen), massive crystal structure, conchoidal fracture.
Formation & geological history
Formed from silica-rich fluids depositing in cavities or cracks in rocks, often volcanic or sedimentary environments.
Uses & applications
Lapidary, tumbling, jewelry making, ornamental stone, collecting.
Geological facts
Jasper is an opaque variety of chalcedony, colored by various impurities like iron oxides (red/brown). When wet, it shows enhanced colors and patterns.
Field identification & locations
Identify by its hardness (scratches glass), waxy luster, lack of cleavage, and typical patterns/colors. Often found in riverbeds, beaches, and gravel deposits.
