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![PDF] CHALK STONE RESTORATION WITH HYDROXYAPATITE-BASED NANOPARTICLES | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/6efb56eedbbb1590c86683bbf37b30ed960caf6e/3-Figure2-1.png "PDF] CHALK STONE RESTORATION WITH HYDROXYAPATITE-BASED NANOPARTICLES | Semantic Scholar")
PDF] CHALK STONE RESTORATION WITH HYDROXYAPATITE-BASED NANOPARTICLES | Semantic Scholar
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Chalk: A biological limestone formed from shell debris
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