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"PM 2Ring" <nomail@nomail> schreef in bericht
news:web.445210571843be3376ba2c900@news.povray.org...
>
> Thanks, Thomas. It's always nice to get your geologist's approval of my
> stones.
Oh hum... <grin>
> Living in Sydney, I've seen weathered sandstone all my life, and plenty
> weathered by seepage. Sydney basin is built on sandstone and shale. As
well
> as the white, yellow and apricot colours of my palette, the real stones
have
> 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.
>
It very much depends on the minerals in solution percolating through. Iron
of course, manganese like dlm says. I am not too familiar with that branch
of the trade. The irony is of course that I am living in a country that is
very poor in hard rock! But you can get the same kind of staining in sands
too, especially in the older deposits from the Pleistocene. And sands are
the building blocks of sandstones, so...
Thomas
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news:44531438@news.povray.org...
>
>The irony is of course that I am living in a country that is
> very poor in hard rock!
Just wait few millions years ;-)
Marc
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"PM 2Ring" <nomail@nomail> wrote:
>
> Here's a large stone block sitting on a floor in a geology museum (maybe :)
> Sorry, the source code is a bit messy...
>
Wow, that's really excellent. Thanks for posting the code, especially the
isosurface functions. I look forward to playing around with those.
Ken
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"Marc Jacquier" <jac### [at] wanadoo fr> schreef in bericht
news:4453b0c2@news.povray.org...
>
> news:44531438@news.povray.org...
> >
> >The irony is of course that I am living in a country that is
> > very poor in hard rock!
>
> Just wait few millions years ;-)
>
<grin> yes, I intend to! There will probably be a small ocean over here, if
the Lower Rhine slenk continues to open a bit more. Nothing spectacular
however. We have first to close the Mediterranean (and relocate all those
poor tourists).
Thomas
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High!
Thomas de Groot wrote:
> The irony is of course that I am living in a country that is
> very poor in hard rock!
Yes, the Netherlands aren't exactly Afghanistan... but what if you take
a closer look at Mt. Vaalserberg in your far south?
See you in Khyberspace!
Yadgar
Now playing: In the Dutch Mountains (The Nits) ;-)
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news:4454de9f$1@news.povray.org...
> High!
>
> Thomas de Groot wrote:
> > The irony is of course that I am living in a country that is
> > very poor in hard rock!
>
> Yes, the Netherlands aren't exactly Afghanistan...
The Netherlands and Afghanistan have something common, they both are.. very
different :-)
Marc
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> High!
>
> Thomas de Groot wrote:
>
>> The irony is of course that I am living in a country that is
>> very poor in hard rock!
>
>
> Yes, the Netherlands aren't exactly Afghanistan... but what if you take
> a closer look at Mt. Vaalserberg in your far south?
>
I think you'll find limestone there, not a particularly hard rock.
> See you in Khyberspace!
>
> Yadgar
>
> Now playing: In the Dutch Mountains (The Nits) ;-)
The only Dutch Mountains worth mentioning.
now playing: nothing.
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news:4454de9f$1@news.povray.org...
> High!
>
> Thomas de Groot wrote:
> > The irony is of course that I am living in a country that is
> > very poor in hard rock!
>
> Yes, the Netherlands aren't exactly Afghanistan... but what if you take
> a closer look at Mt. Vaalserberg in your far south?
>
Sure. That's why I said "poor". Only the extreme east and south of the
country.
>
> Now playing: In the Dutch Mountains (The Nits) ;-)
<grin> the only Dutch mountains I know of are the "Frisian Mountains" that
appear on the label of Beerenburg bottles!!!
Thomas
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That's a great sandstone texture.
--
Bill Hails
http://billhails.net/
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"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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