Mineral
Agate
SiO2
Hardness: 6.5-7, Color: translucent white to greyish, Luster: vitreous, Crystal structure: microcrystalline quartz, Cleavage: none, Specific gravity: 2.58-2.64
- Hardness
- 6
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Physical properties
Hardness: 6.5-7, Color: translucent white to greyish, Luster: vitreous, Crystal structure: microcrystalline quartz, Cleavage: none, Specific gravity: 2.58-2.64
Formation & geological history
Forms in cavities of volcanic rocks or ancient lavas from silica-rich groundwater over millions of years.
Uses & applications
Commonly used in jewelry making, ornamental objects, and crystal healing.
Geological facts
Agate is a variety of chalcedony. This particular piece has been polished and drilled to be used as a pendant or charm.
Field identification & locations
Identified by its waxy luster, translucency, and hardness (can scratch glass). Often found 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