![Roberto "Beto" López Santiago of Etzatlán poses alongside a half-buried megaspherulite lying alongside the road to the old Amparo silver mine, 4.7 kilometers north of the Piedras Bola developed area in Jalisco.](/photos/7919-m-piedrasbola-p-roberto-beto-lopez-santiago-of-etzatlan-poses-alongsid-large.jpg?1245497277 "Roberto "Beto" López Santiago of Etzatlán poses alongside a half-buried megaspherulite lying alongside the road to the old Amparo silver")
Roberto "Beto" López Santiago of Etzatlán poses alongside a half-buried megaspherulite lying alongside the road to the old Amparo silver mine, 4.7 kilometers north of the Piedras Bola developed area in Jalisco.
© John Pint, 2009
Source article: Las Piedras Bola: the great stone balls of Ahualulco