Ugh that sucks. That is a large conchiolin (shell) deposit due to something irritating the clam. They put down excessive amounts of shell to try to wall off whatever is trying to get in. Often, if a lot of effort is put into creating the conchiolin, the clam can go into decline as it is using all of its resources for that instead of usual growth etc.
Sorry to see that, that is one of the largest deposits I've seen. Did you break it open to see what was inside?
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