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The Coppermind has spoilers for all of Brandon's published works, now including The Lost Metal and Tress of the Emerald Sea (Secret Project 1). Information about books that have not yet been released, like the other secret novels releasing in 2023 and Stormlight 5, is allowed only on meta-pages for the books themselves. For more details, see our spoiler policy. To view an earlier version of the wiki without spoilers for a book, go to the Time Machine!

Type Rock
World Lumar
Universe Cosmere
Featured In Tress of the Emerald Sea
This page or section contains spoilers for Tress of the Emerald Sea!
This information has the ability to potentially ruin elements of the plot for the reader. Proceed with caution if you have not read this book.
This page or section needs to be updated with new information for Tress of the Emerald Sea!
Be aware that in its current state, it may not include all additional content yet.

Saltstone is a type of rock found on Lumar. It is black, crumbles easily, and gets into everything. Plants cannot grow on Saltstone, and it taints soil in contact with it, killing even potted plants over time. It also makes food and drink taste different, giving it all a salty flavor.

The island of Diggen's Point is made of Saltstone, and operates mines to extract salt from the rock.[1] The saltstone of the island is powerful enough to kill aether spores floating above it.[1]


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