mineral
Agate
SiO2
AI-generated identification · may be incorrectHardness 6.5-7 on Mohs scale, waxy luster, microcrystalline quartz, no cleavage, conchoidal fracture. Displays banding and various colors due to impurities.
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 6.5-7 on Mohs scale, waxy luster, microcrystalline quartz, no cleavage, conchoidal fracture. Displays banding and various colors due to impurities.
Formation & geological history
Forms in cavities of eruptive rocks or ancient lavas where silica-rich groundwater deposits microcrystalline quartz in concentric layers over long periods.
Uses & applications
Commonly used in jewelry, ornamental objects, carving, and as a collector's specimen.
Geological facts
Agate is a variety of chalcedony. The colorful bands and patterns are caused by traces of oxides of iron, manganese, titanium, chromium, nickel, and other elements.
Field identification & locations
Identified by its waxy luster, hardness (can scratch glass), and characteristic banding or moss-like inclusions. Widely found globally in volcanic regions.
