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Re: is biotite safe?

On Mon, 27 Sep 1999, Chuck Gadd wrote:

> I collected a bunch of nice river gravel from a local river.  I boiled it
> to kill off any nasties living in the gravel (I saw some larvae and worms),
> but I'm a little concerned about one of the minerals in the gravel.  It looks
> like something that I've always called "fool's gold", and I thought it was
> pyrite.  It's small shiny gold flakes.   After a little research, I now
> think that it's actually Biotite, which commonly occurs as flakes.

Biotite is chemically safe.  It may tend to move around a bit.  In fact
all the micas are usually safe, but they tend to wash about rather easily.

Roger Miller