Granite is one of the hardest stones, and requires such different techniques to sedimentary stones that it is virtually a separate trade. With great persistence, simple mouldings can and have been carved from granite, for example in many Cornish churches and in the city of Aberdeen. Generally, however, it is used for purposes that require its strength and durability, such as kerbstones, countertops, flooring, and breakwaters.
Igneous stone ranges from very soft rocks such as pumice and scoria to somewhat harder rocks such as tuff to the hardest rocks such as granite and basalt.