I uploaded this photo under Siglo XX mine in Mexico, since this was the locality provided with the specimen. No similar entries under silo xx however and as stated in the photo description I am not sure about the provenance.
I've come across the El Filo Vein entry in mind at (also mexico) and it occurred to me this specimen seems to be a lot alike?
What do you think change the locality?
Anyone more information about the El Filo deposit?