Hi Mary Beth, you can certainly try! I would try pulverizing some of the starter with a mortar and pestle, or you could try breaking it into bits and putting it in a coffee grinder. Once you've broken it up a bit I would soak it in some lukewarm water overnight (twice the amount of water as starter, by weight). This blog on how to dry a starter includes directions for reviving, which should work for you as well. Basically once you've managed to liquify the starter you have, you'll want to feed it twice a day at room temperature for a few days, looking for the starter to return to its normal aroma and rising behavior. 

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