Nodules from Loma Pinta (painted hill) are found on Rancho El Diablo, about 15 miles east of Estacion Moctezuma. More exactly in the reddish-brown andesite of Cerro Brejo de Diablo (devils needle).There has been no active collecting since the early 1970s. The agates are very similar to Moctezuma Agates.
They are out of a weathered andesite and do not show signs of transportation. The outer coating is smooth, its colour is green to reddish-brown. Banding shows pale pastel colours, sometimes with dark spots.
Further informations are given from Brad L. Cross in his book “The Agates of Northern Mexico”, page 81-82.