mineral
Banded Agate (Tumbled)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
AI-generated identification · may be incorrectHardness: 6.5-7 on the Mohs scale. Color: Brown, tan, cream, and white concentric or parallel bands. Luster: Waxy to vitreous when polished. Crystal structure: Trigonal (microcrystalline/cryptocrystalline). Cleavage: None, fractures with a conchoidal break.
- Hardness
- 6
- Color
- Brown, tan, cream, and white concentric or parallel bands
- Luster
- Waxy to vitreous when polished
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Physical properties
Hardness: 6.5-7 on the Mohs scale. Color: Brown, tan, cream, and white concentric or parallel bands. Luster: Waxy to vitreous when polished. Crystal structure: Trigonal (microcrystalline/cryptocrystalline). Cleavage: None, fractures with a conchoidal break.
Formation & geological history
Formed in cavities within volcanic rocks or ancient sedimentary formations where silica-rich fluids deposited successive layers of microcrystalline quartz over time.
Uses & applications
Widely used in lapidary art, jewelry making, tumbled stone collections, and decorative accents due to its distinct, attractive banding.
Geological facts
Agate banding is created by subtle changes in mineral composition and trace elements during the slow crystallization of silica-rich groundwater inside rock pockets.
Field identification & locations
Identify by its characteristic fine parallel or concentric layering, translucent to opaque body, high hardness, and smooth waxy polish. Commonly found worldwide in volcanic host rocks and river gravels.
