Hornstone
Zell's Condensed Dictionary · 1879 · p. 24
(horn's ton.) (Min.) A brittle flint-like var. of quartz. [s. 462]
Bu kavram başka kaynaklarda da geçiyor
The American Dictionary and Cyclopedia (1910)
The American Dictionary and Cyclopedia (1910)
Chandler's Encyclopedia (1898)
The Century Dictionary: The Encyelopedic Lexicon of the English Language (1887)
A Dictionary of Arts, Manufactures and Mines (1840)
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