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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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"Thomas de Groot" <t.d### [at] internlnet> wrote:
> "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...
Yes, I was expecting you to be an expert in sedimentary rocks, from your
location. I guess you're attracted to more exotic geography. :)
There's a big tunnel being built here at the moment and my route to work
lets me see most of the constructions. So I've seen plenty of freshly
exposed sandstone lately. Some of the pieces have been beautiful.
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"PM 2Ring" <nomail@nomail> schreef in bericht
news:web.445621421843be3376ba2c900@news.povray.org...
>
> Yes, I was expecting you to be an expert in sedimentary rocks, from your
> location. I guess you're attracted to more exotic geography. :)
Well yes, I do certainly. But that said, the soft rock geology we have here
can be very complex too and poses a lot of challenges. However, the main
problem is that you have to do most work from boreholes, and I miss those
beautiful outcrops sometimes....
>
> There's a big tunnel being built here at the moment and my route to work
> lets me see most of the constructions. So I've seen plenty of freshly
> exposed sandstone lately. Some of the pieces have been beautiful.
>
Oh dear! Temptation! Temptation! :-)
Thomas
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