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Re: pyrophyllite

Bob Dixon is thinking of using it.

A word of caution: Pyrophyllite often occurs naturally in formations that
also contain alum. For the insecticide diluent trade, the pH is adjusted,
through the amount of included alum, by selective mining. Some
iron-containing material is often added so the farmers doesn't think he's
being shorted on sulphur. :-) Makes it more tan than white. Check the pH of
some water with it added to avoid unpleasant surprises.


Wright Huntley, Fremont CA, USA, 510 494-8679  huntleyone at home dot com

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