- Chalcedony (Var: Agate), Aragonite
- Thumbnail, 2.7 x 2.3 x 1.5 cm
- Mun. de Casas Grandes, Chihuahua, Mexico
Just a very interesting Mexican thumbnail specimen. You can make out the form of the original crystal of aragonite, which has been pseudomorphed by orangey agate. Unusual. Ex. Carlton Davis Collection.