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Date: | Tue, 19 Oct 2004 13:13:19 +0200 |
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I support the observation of vitrified fragments in the burnt coal and its
being
white to black in colour. Know of one large deposit (1907) at the end of
the
line that came from Salisbury (now Harare) to a gold mine called Ayrshire.
Trains were refuelled and cleaned out at this point. No chunks of rock as
our coal is possibly purer than some of the shale-rich material mined in
the
UK. Odd bits of oxidised metal included as one would expect from repairs
etc at the workshops.
Can not remember a smell but we are in tropical environment so it could
have
gone, while I only observed the surface or fresh areas of animal burrow.
You mention one area of about 1m. What about the others? Texture-wise how
different is this to the surrounding soil medium?
Rob Burrett
Harare
ZIMBABWE
> ----- Original Message -----
> From: "Chris Salter" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Tuesday, October 19, 2004 10:59 AM
> Subject: Re: Coal (?) Ash Deposit
>
>
> > Robert,
> > Whatever, this is it is not coal ash. I can only speak of
British
> > environment but coal ash usually will have larger unburnt and semi-burnt
> > fragments of rock in it. These are usually shale so show a layered
> > structure and are red, or grey to white.
> > If the coal has any sulphur in it, and most do, it will smell,
> this
> > does not fade quickly. I use the smell of the lightly damped material as
> > one of the test when examining possible Roman coal ashes before using an
> > optical microscope to determine the nature of the microfragments within
> > the ash.
> > Coal ash will normally contain a fair amount of slag-like
> vitrified
> > material (clinker) which would be immediately visible.
> >
>
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