Mineral
Agate
SiO2
Hardness: 6.5-7 (Mohs scale), Color: White, gray, translucent with banding, Luster: Waxy to vitreous, Crystal structure: Cryptocrystalline, Cleavage: None, Specific gravity: 2.58-2.64
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: White, gray, translucent with banding, Luster: Waxy to vitreous, Crystal structure: Cryptocrystalline, Cleavage: None, Specific gravity: 2.58-2.64
Formation & geological history
Formed from silica deposited in rock cavities, often volcanic. The banding represents rhythmic crystallization over time.
Uses & applications
Used in jewelry, typically cabochons, and ornamental objects for its attractive banding. Also collected by hobbyists.
Geological facts
Agates are characterized by their fine grain and bright colors, although this specimen is more muted. The banding is often concentric.
Field identification & locations
Identify by its waxy luster, hardness (can scratch glass), and distinctive banding. Found worldwide, particularly in volcanic rocks.
More like this
Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
![Green Apatite on Albite (Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]) — mineral](https://media.rockidentification.com/2391a63f-fb20-47d5-af9a-2035851eb32e-thumbnail.jpg)
Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
mineral