Based off information I’ve gleaned from the website cited below, it looks like the shell of most nuts are perfectly fine for composting. It’s just walnut shells you want to watch out for, as they contain chemicals that inhibit plant growth and kill off bacteria.
Nut shells are generally going to have a carbonaceous effect on a compost pile (enriching with carbon). However, while they will break down eventually, they will take a while. Breaking them down by crunching or putting in a spice grinder before placing them in your compost pile will help them to dissolve faster and provide the nutrients to your pile. Grass clippings, garden left overs and small twigs and branches are all good sources of carbon for your compost.
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