mineral
Agatized Jasper / Chalcedony
SiO2
AI-generated identification · may be incorrectHardness 6.5-7 on Mohs scale. Microcrystalline quartz showing varied colors (reds, yellows, browns) and waxy luster. May have conchoidal fracture.
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Physical properties
Hardness 6.5-7 on Mohs scale. Microcrystalline quartz showing varied colors (reds, yellows, browns) and waxy luster. May have conchoidal fracture.
Formation & geological history
Formed from silica-rich fluids precipitating in cavities or fractures within rocks, often volcanic or sedimentary. The different colors come from trace impurities like iron oxides.
Uses & applications
Commonly used in lapidary arts for tumbling, cabochons, and ornamental pieces. Popular among rockhounds.
Geological facts
This specimen features a vug or small cavity, which is a common occurrence in chalcedony formations, sometimes lined with tiny quartz crystals (druzy).
Field identification & locations
Identify by its waxy luster, hardness (can scratch glass), and typical banded or mottled colors. Often found in riverbeds or areas with volcanic history.
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