- a variety of quartz resembling flint.
Origin of hornstone
Examples from the Web for hornstone
Historical Examples of hornstone
About ten miles north of this point, the upper calcareous, or surface rock, embraces nodules of hornstone.
The occurrence of a hard variety of hornstone, which is not flint, is apparently confined to the compact, fetid variety.
Among the rubbish of the diggings, fragments of hornstone occur.
The shales become dense, highly crystalline rocks of a "hornstone" type, with porphyritic developments of silicate minerals.The Economic Aspect of Geology
C. K. Leith
Another of the dikes of the north-east of Ireland has converted a mass of red sandstone into hornstone.A Manual of Elementary Geology