mineral
Agate
SiO2
Hardness 6.5-7, multicolored (white, red, orange), waxy luster, cryptocrystalline, no cleavage, specific gravity 2.58-2.64
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Physical properties
Hardness 6.5-7, multicolored (white, red, orange), waxy luster, cryptocrystalline, no cleavage, specific gravity 2.58-2.64
Formation & geological history
Formed in cavities of igneous rocks, primarily volcanic rocks, through the deposition of silica from groundwater
Uses & applications
Jewelry, lapidary arts, decorative objects, collecting
Geological facts
Agate is a variety of chalcedony characterized by its banded appearance and is named after the Achates River in Sicily where it was first discovered
Field identification & locations
Identified by its distinctive banding and colors, commonly found worldwide in areas with past volcanic activity
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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