mineral
Banded Agate
Cryptocrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness: 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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Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
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Granite
Granite (Phaneritic intrusive igneous rock)
igneous