"dlm" <me### [at] addressinvalid> wrote:
> > some beautiful shades of red, ranging from pale rose pinks to an almost
> > purple colour. I know the reds & yellows come from iron, but I don't know
> > about the purple.
>
> Manganese?
> See e.g. http://web.uct.ac.za/depts/geolsci/dlr/kirstenbosch/mang1.htm

Hmmm... Yes that does look like the right hue. I guess I should really look
up some local geology info. Or visit the Sydney Geology Museum with a sample
in hand. :)

> Nice fresh-hewn sandstone btw.
>
> DLM

Thanks, DLM, and thanks to everybody for your kind comments about this
stone.

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