mineral
Banded Agate
Silicon Dioxide (SiO2) - Chalcedony Variety
Hardness: 6.5-7 on the Mohs scale. Color: Translucent gray-blue base with concentric banding of grayish-green and dark reddish-maroon jasper inclusions. Luster: Waxy to vitreous. Crystal system: Microcrystalline (trigonal). Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 on the Mohs scale. Color: Translucent gray-blue base with concentric banding of grayish-green and dark reddish-maroon jasper inclusions. Luster: Waxy to vitreous. Crystal system: Microcrystalline (trigonal). Cleavage: None (conchoidal fracture).
Formation & geological history
Formed in cavities within volcanic or metamorphic rocks through the deposition of silica-rich solutions in layers over millions of years, often eroded out by wave action on beaches.
Uses & applications
Popular for lapidary work, jewelry making, cabochons, tumbling, and decorative stone collecting.
Geological facts
Agates are microcrystalline quartz varieties characterized by their translucency and distinctive banding patterns formed by subtle changes in trace mineral elements during silica deposition.
Field identification & locations
Identified by its waxy luster, smooth beach-worn texture, translucency when backlit, and distinctive concentric ring/band patterns. Commonly found along coastal beaches, river beds, and gravel bars.
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