If you have any Chemistry questions, please ask me.
As for vermiculite which was discussed before: I personally analysed over 300 Vermiculite samples from the houses in SW Ontario. The overall statistics (approximate) looks like:
Asbestos in Vermic. content Frequency or Probability to encounter.
>5% ~0%
0.5-4.9% 1-2%
0.1-0.49% 2-5%
<0.1% 90-95%
Please note that according to Ontario Reg. Asbestos material is the one with concentration >0.5%