mineral
Polished banded agate (likely carnelian agate)
Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration
AI-generated identification · may be incorrectHardness 6.5–7 Mohs; orange-red with cream banding, waxy to vitreous luster, and no visible cleavage. The specimen appears polished and possibly carved or shaped.
Identified More mineral →
Explore Polished banded agate (likely carnelian agate) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness 6.5–7 Mohs; orange-red with cream banding, waxy to vitreous luster, and no visible cleavage. The specimen appears polished and possibly carved or shaped.
Formation & geological history
Agate forms as silica-rich fluids fill cavities in volcanic rocks, depositing successive chalcedony layers. Its age depends on the host rock and cannot be determined from the image.
Uses & applications
Used for cabochons, beads, carvings, ornaments, and small decorative objects; also collected as a polished specimen.
Geological facts
Agate’s contrasting bands develop as silica is deposited in layers, while iron impurities commonly produce orange and red hues.
Field identification & locations
Look for translucent edges and curved or concentric bands; common sources include Brazil, Uruguay, India, and the United States. The pictured object’s exact variety is uncertain from appearance alone.
