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I bookmarked the second link as I always use the first one... looks very helpful!Welcome to BYC. Most likely they are mineral deposits. Here is some reading about eggshell quality:
https://www.backyardchickens.com/a/common-egg-quality-problems
https://www.alltech.com/sites/default/files/alltech-egg-shell-quality-poster.pdf
Welcome to BYC!