There are three more common types of asbestos in the UK :
White asbestos (technically Known as chrysotile)
Brown asbestos (amosite / gunerite)
Blue asbestos (crocidolite / riebeckite)
~ and three more unusual types in the UK :
All of them are recognised as carcinogens by the World Health Organisation.
When made into building materials, most are mixed in a cement based slurry ~ and this cement coats every fibre, so that when it dries / sets, it all looks grey. Because it just looks grey (dirty white ?), many people just assume that it will all be white asbestos, but this isn’t true.
The only way to know what asbestos is present, is to have it properly surveyed, sampled and analysed in a UKAS accredited laboratory.