Re: testing rocks?

[IDMiamiBob@aol.com]

In a message dated 97-12-01 00:58:34 EST, Robert wrote:

<< The rock is said to be granite and has fleck of a metallic flecks.  I
> have read that some rocks with these flecks will give off toxic
> substances.  Any ideas?
>>
The metallic flakes in granite is generally mica, which is harmless.  It is
unlikely that unoxidized metals will survive the igneous origins of granite.
 You could test with muriatic acid for a response.  The safest bet is to let
the rock sit in a tank for a month, then test for any changes in pH,
hardness, alkilinity, and maybe trace metals, if you have all of those test
kits available.