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schalstein

noun schal·stein \ ˈshälˌs(h)tīn \
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Definition of schalstein

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

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Origin and Etymology of schalstein

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

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