Mineral
Agate
SiO2
Hardness: 6.5-7, Color: Gray, white, yellow, brownish, Luster: Waxy to vitreous, Crystal structure: Cryptocrystalline
- Hardness
- 6
- Luster
- Waxy to vitreous, Crystal structure: Cryptocrystalline
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Physical properties
Hardness: 6.5-7, Color: Gray, white, yellow, brownish, Luster: Waxy to vitreous, Crystal structure: Cryptocrystalline
Formation & geological history
Formed in nodules in volcanic rocks or ancient lavas, often filling cavities produced by the release of volatiles in the molten rock.
Uses & applications
Used in jewelry, typically cut into cabochons or beads. Also collected by rock enthusiasts.
Geological facts
Agate is a banded form of finely-grained, microcrystalline Quartz.
Field identification & locations
Identify by its waxy luster, hardness (can scratch glass), and characteristic banded or mottled patterns. Commonly found worldwide in volcanic areas.
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