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hornstone

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horn⋅stone

[hawrn-stohn]
–noun Archaic.
a variety of quartz resembling flint.

Origin:
1720–30; trans. of G Hornstein
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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hornstone

noun
a fine-grained metamorphic rock formed by the action of heat on clay rocks [syn: hornfels
WordNet® 3.0, © 2006 by Princeton University.
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