HSE has issued a new guidance: Asbestos in some types of marble and other stone: assessing the risk

Certain rocks and minerals, such as some types of marble and basalt, can occasionally contain very small amounts of naturally occurring asbestos.  This guidance is for those supplying, working with, or using marble or other stone products.  It provides an overview of naturally occurring asbestos in such products including: the risk to health; the actions you should take to comply with the law; and a staged approach to identifying any possible naturally occurring asbestos content.