Há pelo menos um artigo on-line dizendo que é ilegal em áreas protegidas em torno dele, do Independent:
Rock star: a atração vulcânica de Tenerife
Then, after a brief stop to allow the children to examine some lava shrapnel (it turned out that it was illegal to remove stones from these protected areas), we reached the vast caldera of Teide itself: a bleak, alien landscape, the soil too poor to support much more than bright-green moss.