You're right, sorry, Berridge on Camelback. I tend to transpose those two in my mind.
There is a book you may enjoy called Japan Modern that shows lots of uses for this rock in transitional indoor/outdoor spaces. Often it is embedded on end in concrete like a row of cookies to create a kind of non-slip walk.
For more intersting applications with concrete go to the Desert Botanic Garden and note its use on all their handrails throughout the grounds. Also, at DC Ranch they've used it (or something like it, I don't recall exactly) in the Marketplace park walkways, but some of the stones are popping out.
I will take a picture for you of how I am using it now in my CMU garden planter to support a galvanized grille. I was lucky to find a small batch of nearly purple stones and the effect is really lovely.