mineral
Tumbled pink banded agate
Chalcedony (microcrystalline quartz, SiO₂), an agate variety
AI-generated identification · may be incorrectHardness 6.5–7 Mohs; pale pink to salmon with fine cream and reddish concentric bands, vitreous to waxy luster, cryptocrystalline structure, and no visible cleavage. The polished surface and translucent bands are characteristic.
Identified More mineral →
Explore Tumbled pink banded 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; pale pink to salmon with fine cream and reddish concentric bands, vitreous to waxy luster, cryptocrystalline structure, and no visible cleavage. The polished surface and translucent bands are characteristic.
Formation & geological history
Forms when silica-rich groundwater fills cavities in volcanic rocks, depositing successive layers of chalcedony; banding may develop over millions of years, commonly during the Cenozoic or older volcanic episodes.
Uses & applications
Used for cabochons, beads, carvings, paperweights, and tumbled-stone collections; durable and attractive but generally inexpensive.
Geological facts
Agate’s bands record changing chemistry and conditions during cavity filling. The specimen may also be marketed as pink Botswana agate or dyed agate, though its delicate natural banding appears consistent with agate.
Field identification & locations
Identify by testing for hardness greater than steel, observing curved or concentric banding, and checking that it does not fizz in dilute acid. Common sources include Brazil, Uruguay, Mexico, Botswana, India, and the United States.
