See http://www.google.com--->"geochemical database".
>hello all,
>i am working on the clay mineralogy of the subsurface Tapti basin,Bombay
>Offshore, India...
>the lithologies are monotonously shale and sandstone.
>for chemical analysis of bulk samples what type of rock should be taken as
>standard? and wht is the approximate percentage of silica in shale?
>please help me ...
> with regards
> -amit
>--
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