noun Archaic.
a variety of quartz resembling flint.

1720–30; translation of German Hornstein

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World English Dictionary
hornstone (ˈhɔːnˌstəʊn)
chert another name for hornfels
[C17: translation of German Hornstein; so called from its appearance]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Production followed silver-bearing calcite ore shoots between a hornstone hanging wall and dolomite footwall.
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