The boulder is located in a clearing in the forest, between the villages of Emilcin and Komaszyce, Opole Lubelskie municipality. According to local legend, there was supposed to be an imprint of the Blessed Virgin Mary's foot on its surface. The boulder was lost in the 1980s. It was taken to Warsaw by employees of the School of Head Farming, then sunk in a pond in Obory near Konstancin. It was thought to be related to the widely reported third-degree encounter with a UFO by village resident Jan Wolski.
Information sources: https://www.dziennikwschodni.pl/magazyn/tajemnicadiabelskiego-kamieniawideo,n,1000071844.html (accessed April 20, 2023); field search
The original location of the stone on Google maps
Archival photos of the Emilcin stone along with the footer available here.