mineral
Agate (Puddingstone style)
Silicon Dioxide (SiO2) with impurities
AI-generated identification · may be incorrectHardness: 6.5-7 on Mohs scale. Color: Translucent grey, tan, and brown with rounded inclusions. Luster: Vitreous to waxy when wet/polished. Structure: Cryptocrystalline. Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- Translucent grey, tan, and brown with rounded inclusions
- Luster
- Vitreous to waxy when wet/polished
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Translucent grey, tan, and brown with rounded inclusions. Luster: Vitreous to waxy when wet/polished. Structure: Cryptocrystalline. Cleavage: None (conchoidal fracture).
Formation & geological history
Formed as secondary deposits in volcanic cavities or sedimentary pockets where silica-rich groundwater precipitates over long periods, often filling in around existing pebbles to create a conglomerate-like appearance.
Uses & applications
Primarily used for lapidary work, jewelry (cabochons), as decorative stones, or for rock tumbling and collecting.
Geological facts
Agates are a variety of chalcedony. This specific piece shows characteristics of a 'puddingstone' or conglomerate agate, where distinct rounded grain inclusions are cemented in a chalcedony matrix.
Field identification & locations
Identify by its waxy luster and toughness. It won't be scratched by a steel knife. Commonly found in riverbeds, glacial till, or volcanic regions such as the Great Lakes area or the Pacific Northwest.
