Hornstone is a 9 letter English word. It's valid Words with friends word worth 13 points.
You can make 354 anagrams from letters in hornstone (ehnnoorst).
1720-30; translation of German Hornstein
It was a piece of hornstone, which I told him his tribe had probably brought here centuries before to make arrowheads of.
hornstone occurs under three modifications; splintery hornstone, conchoidal hornstone, and woodstone.
The sandstone has been indurated, and has assumed a texture approaching to hornstone near the junction.
The shales become dense, highly crystalline rocks of a "hornstone" type, with porphyritic developments of silicate minerals.
About ten miles north of this point, the upper calcareous, or surface rock, embraces nodules of hornstone.
The hornstone which occurs in secondary limestone is called chert by the English miners.
The occurrence of a hard variety of hornstone, which is not flint, is apparently confined to the compact, fetid variety.
Another of the dikes of the north-east of Ireland has converted a mass of red sandstone into hornstone.
Among the rubbish of the diggings, fragments of hornstone occur.
The geological locality of hornstone is remarkable; for it occurs in both ancient and recent formations.