mineral
Banded Agate
Agate (Cryptocrystalline Quartz, SiO2)
Hardness: 6.5–7 on Mohs scale; Color: Concentric white, beige, and tan bands; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58–2.64.
- Hardness
- 6
- Color
- Concentric white, beige, and tan bands
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5–7 on Mohs scale; Color: Concentric white, beige, and tan bands; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58–2.64.
Formation & geological history
Formed as secondary deposits in volcanic rock cavities (amygdules) or sedimentary veins. Silica-rich groundwater percolates through voids, depositing rhythmic layers over millions of years.
Uses & applications
Popular for lapidary work, jewelry (cabochons), burnishing tools, and as collectible pocket stones or decorative home accents.
Geological facts
The distinct banding is caused by variations in the composition of the silica-bearing solutions during deposition. Agates have been used for amulets and ornaments since at least the Neolithic era.
Field identification & locations
Identify in the field by its distinctive parallel banding, hardness (it will scratch glass), and waxy feel when water-worn. Common in riverbeds and glacial tills.
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Green Apatite on Albite
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