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Posted in response to Montmorillonite from brian on August 13, 2013 at 22:14:44:

Re: Montmorillonite

Are you sure it is montmorillonite? With the associated minerals, it is more likely to be a mica (sericite?). It is possible to dissolve many silicates with hot, high pH (alkaline)solutions. If you have scraps to test, try starting with a cold solution of dishwasher detergent like Calgon and slowly heat sample and solution, stirring frequently. Bring to a near simmer and hold the temperature there for a while, still stirring, to see if there is any change. Cool slowly. Warning - this may etch/dissolve many silicates including feldspars.

From MikeR - August 28, 2013 at 09:27:05
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