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This was an interesting find - a colony of limpets with a blue shell. There are not any blue limpets that I could find on the internet. Fortunately in the second picture there is a limpet on the left side that revealed some of the story. It is a Shield limpet with faint ridges and revealing a blue color underneath the outer layer. I'm not sure what is causing the blue color.
Spotted on an exposed rock at low tide.