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https://www.esrf.eu/news/general/mollusc-shell-engineering#:~:text=Mollusc%20shells%20consist%20almost%20entirely,hungry%20lobster%20or%20other%20dangers.
https://epod.usra.edu/blog/2009/10/sidewalk-chalk-and-the-calcium-cycle.html
https://en.wikipedia.org/wiki/Chalk
https://geology.com/rocks/chalk.shtml
https://www.etsy.com/market/chalkboard_seashells
https://www.washingtonpost.com/archive/lifestyle/food/2002/06/12/chalk-one-up/5e2ce9b5-dfc1-40c0-9a43-af22b3125750/
https://www.ebay.com/itm/Chalk-Blackboard-Scallop-Sea-Shell-Shape-for-Memos-Notes-Home-Decor-Nautical-/272237222402
https://www.britannica.com/science/chalk
https://www.childrensmuseum.org/blog/real-science-eggshell-sidewalk-chalk
https://www.theguardian.com/lifeandstyle/2006/dec/09/familyandrelationships.family9
http://www.todayifoundout.com/index.php/2015/05/blackboard-chalk-isnt-chalk/
https://br.pinterest.com/pin/41165784082139768/