... temperature and low temperature outside. frost resisting black slates , black cuture stones, black cultural stones No ... radioactivity, genuine healthy black slates, black cultural slates / black cultural slates .Stone Form: Black slates, cut-to-size slate, ... Siena - Burma ,Pure White Marble, White Jade Marble, Picasso White Marble, Mugla White Marble, Green Wood Jade Marble, Angola Portoro , Ivory ...