HELP:: Minerals UK

Hi,

I would like to purchase few minerals(eg::Illite, Kaolinite,chlorite) 
 in small quantities(~500 g) for my suspended sediment experiments. If
available i would prefer to buy these minerals having source in
Cornwall/Devon in  United Kingdom.

Can anyone please inform me about possible sources/shops.

best wishes
RC 
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http://www.ims.plym.ac.uk/geomatics/