silex

They had implements of copper, as well as of silex, and porphyries.

Incentives to the Study of the Ancient Period of American History

Henry R. Schoolcraft

The tower we see there was that of the windmill which ground the silex.

Historic Paris

Jetta S. Wolff

At the bottom of each pore a thin lamella of silex, perforated by four to six irregular, roundish, double-contoured porules.

Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, First Part: Porulosa (Spumellaria and Acantharia)

Ernst Haeckel

Other filling material as silicate of soda, borax, talc or silex are used.

Soap-Making Manual

E. G. Thomssen

All this rich land was thickly strewed with small fragments of fossil wood, in silex, agate, and chalcedony.

Journal of an Expedition into the Interior of Tropical Australia

Thomas Mitchell