mineral
Banded Agate
Cryptocrystalline Quartz (SiO2)
Hardness: 6.5-7 on Mohs scale; Color: Multi-colored bands (brown, white, grey); Luster: Waxy to vitreous; Structure: Microcrystalline; Cleavage: None (Conchoidal fracture).
- Hardness
- 6
- Color
- Multi-colored bands (brown, white, grey)
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Multi-colored bands (brown, white, grey); Luster: Waxy to vitreous; Structure: Microcrystalline; Cleavage: None (Conchoidal fracture).
Formation & geological history
Forms through the deposition of silica from groundwater into cavities (gas bubbles) in volcanic rocks over millions of years, often in layers.
Uses & applications
Used extensively in jewelry making, ornamental carvings, lapidary arts, and for metaphysical collecting.
Geological facts
The unique banding is caused by rhythmic crystallization of silica. Historically used as amulets for protection, particularly by ancient Greeks.
Field identification & locations
Identified by distinct concentric or parallel banding and translucency when held to light. Common in gravel pits, riverbeds, and volcanic regions.
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Arenite (SiO2 based)
sedimentary
Schist
Schist
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Epidote
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metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock