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schalstein

noun
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schal·​stein | \ ˈshälˌs(h)tīn \
plural -s

Definition of schalstein

: a slaty rock formed by the compression and metamorphism of basaltic or andesitic tuff or lava : slaty greenstone

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History and Etymology for schalstein

German, from schale husk, shell (from Old High German scala) + stein stone, from Old High German

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“Schalstein.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/schalstein. Accessed 18 January 2020.

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