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Re: Reduced iron in substrate?

> From: Dave Gomberg <gomberg at wcf_com>
> Subject: Reducing diet
> Where there had been laterite below the gravel, there was now a mixture of
> laterite
> and COMPLETELY REDUCED IRON.   It looked like tiny iron filings.   

	What makes you think it was iron metal?  Did it rust in water
and air?
> I am pretty sure this black stuff was not a sulphur compound (tho it could
> have been FeS) 
> because it was very dense.  

	Magnetite (Fe3O4) is black, magnetic and dense.  There are also
several iron/sulphur phases that fit those criteria.

Paul Sears        Ottawa, Canada