gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
AI-generated identification · may be incorrectMohs hardness of 6.5 to 7; typically exhibits banded colors; waxy to vitreous luster; trigonal crystal system with microcrystalline structure; conchoidal fracture.
Identified More gemstone →
Explore Agate in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Mohs hardness of 6.5 to 7; typically exhibits banded colors; waxy to vitreous luster; trigonal crystal system with microcrystalline structure; conchoidal fracture.
Formation & geological history
Forms by the deposition of silica from groundwater in cavities of igneous and sedimentary rocks, typically over millions of years.
Uses & applications
Widely used in jewelry, decorative ornaments, and precision instruments like mortar and pestles due to its durability.
Geological facts
Agate is one of the most popular materials used in hardstone carving and was prized as a talisman in ancient civilizations.
Field identification & locations
Identify by its distinct concentric banding and waxy luster; commonly found in volcanic rock cavities worldwide, especially in Brazil and the US.
More like this
Other gemstone specimens
Ammolite
Ammolite (Biogenic Aragonite with trace elements; fossils of Placenticeras meeki and Placenticeras intercalare)
mineral
Gemstone Ring
N/A - Set piece of jewelry, likely Amethyst or Garnet with Diamond or CZ
gemstone
Amber
Succinite (Organic Gemstone)
mineral
Diamond and Gold Jewelry
Carbon (Diamond) / Au (Gold)
gemstone
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Pearl necklace
Pearl, primarily aragonite (CaCO₃) and conchiolin
gemstone