RE: Ph of rocks??

["gooch" <gooch@tznet.com>]

Excellent answer.. Thanks
Phil


> -----Original Message-----
> From: owner-apisto@admin.listbox.com
> [mailto:owner-apisto@admin.listbox.com]On Behalf Of Scot Gillespie
> Sent: Monday, January 31, 2000 8:28 AM
> To: 'apisto@majordomo.pobox.com'
> Subject: RE: Ph of rocks??
>
>
> The pH of one type of rock can vary dramatically as very few of these are
> what could be called a "pure substance" due to the way they are created.
> Therefore listing a definitive pH is not really possible. Added to this is
> the problem with the permeability of the rock to liquids (which
> can solidify
> or crystallise within its structure - also when the rock is formed, or
> reformed, this can be at high temperature or pressure and things which are
> solid at normal temp and pressure can be liquid), which will then give
> various pH readings dependant on how long the rock is allowed to sit in
> water. Sandstone would be a prime example of this - most of the
> world's oil
> reserves are this..., and the stuff that my house is built of is
> loaded with
> magnesium and potassium compounds.
>
> Therefore pH is not the only criteria to consider when selecting
> rocks for a
> tank, and testing for possible harmful chemicals would cost you a fortune.
> If you want to find out what would be suitable locally you could
> refer to a
> local geological society or university.
>
> The only rocks I would add to my tank would be slate, black basalt, and
> white granite, which I check first to ensure that they are fairly
> solid and
> appear to be made up of the one uniform substance - no nice
> looking coloured
> lines etc, running through them. Ideally the best rocks for tanks are
> insoluble and impermeable.
>
> Concrete, not strictly a rock, I would avoid at all cost as you never know
> how well it was mixed up and with what, and there may also be mould oil
> traces in it too.
>
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