Angophora costata is found across a range of eastern coastal regions in Australia, and they are common in the sandstone soil of the Hawkesbury area. They are not of the genus Eucalyptus, but are closely related. One way to distinguish them is that Angophora leaves grow opposite each other on the stem, while in Eucalyptus species they alternate.
We have a few mature specimens in our garden, and they provide shade and habitat for a multitude of creatures. Their heavy limbs also have a tendency to shatter, alas. Just over two years ago, a large tree fell over on our house.
I recently bought a pair of earrings made from A. costata leaves. The leaves were treated with acid, removing all leaf tissue but the skeleton, and then dipped in gold. It's not easy to see from this photo, but against the light you can see the filigree pattern. Ideal for a planty person's lobes!