mineral
Agate
SiO2
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale. Microcrystalline quartz characterized by banded patterns, often translucent.
Identified More mineral →
Explore Agate in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 6.5-7 on the Mohs scale. Microcrystalline quartz characterized by banded patterns, often translucent.
Formation & geological history
Forms in cavities of volcanic rocks, where silica-rich fluids deposit layers of chalcedony over time.
Uses & applications
Used in jewelry, decorative items, and lapidary arts. Historically used for hardstone carving.
Geological facts
Agate is named after the Achates River in Sicily, where it was first discovered by Greek philosophers.
Field identification & locations
Identify by its waxy luster, translucency (often best seen when backlit, as in the image), and characteristic banding.
More like this
Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Calcite–fluorite mineral specimen with iron-oxide staining
Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides
mineral
Septarian Pebble
Septarian nodule / Concretion
sedimentary
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous