A few interesting facts about Sydney sandstone – it was known as yellow block,
named after the Hawkesbury River where the coloured rock is mainly found.
It was an ideal building material for the early colony of Sydney from about 1790 to 1890.
After which it fell out of fashion for some time.
Some of the compression tests done on the Sydney sandstone rate it as stronger than some granite. Making it ideal for lintels and archways. It can range in grade from soft stone to seawall quality.
I think it is a beautiful material, and I am glad to see it making a resurgence.