mineral
Banded Agate
Cryptocrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs), Color: Brown, tan, and reddish-brown bands, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (cryptocrystalline), Cleavage: None, SG: 2.58-2.64
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs), Color: Brown, tan, and reddish-brown bands, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (cryptocrystalline), Cleavage: None, SG: 2.58-2.64
Formation & geological history
Formed primarily in volcanic and metamorphic rocks through the deposition of silica from groundwater into cavities (vesicles) over thousands of years as concentric layers.
Uses & applications
Commonly used for tumbled stones, decorative ornaments, jewelry beads, and precision pendulums due to its durability.
Geological facts
Agate was named by Theophrastus, a Greek philosopher, who discovered the stone along the shore line of the Achates River in Sicily. Each agate is unique in its banding pattern.
Field identification & locations
Identify in the field by its waxy luster, conchoidal fracture, and characteristic banding. Often found in riverbeds or near volcanic outcrops.
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Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
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Granite
Granite (Phaneritic intrusive igneous rock)
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