sedimentary
Banded Agate
Cryptocrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 Mohs; Color: Brown, tan, white, and reddish bands; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- Brown, tan, white, and reddish bands
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 Mohs; Color: Brown, tan, white, and reddish bands; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture).
Formation & geological history
Formed primarily within cavities of volcanic or metamorphic rocks where silica-rich groundwater deposits layers of chalcedony over time.
Uses & applications
Used extensively in jewelry as cabochons, for ornamental carvings, paperweights, and as wear-resistant mortar and pestles in laboratories.
Geological facts
Agate is named after the Achates River in Sicily. Each agate is unique because the banding patterns are formed by varying trace elements during deposition.
Field identification & locations
Identified by its distinctive concentric or parallel banding and translucency. Commonly found in riverbeds, glaciated areas, and volcanic regions globally.
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