1. A compact flinty variety of quartz rock.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• cherystone,
• honystone,
• gornstone,
• bornstone,
• hornstome,
• horstone,
• hornston,
• iornstone,
• horn stone,
• horns tone,
• horspond,
• moonstone,
• turnstoen,
• turrnstone,
• turnstoone,
• hoarestone,
• horastone,
• hoarstone,
• horestone,
• honneystone

• hornist,
• hornstein,
• hornsby,
• hoariness.

The adjective form of the word "hornstone" is "hornstonian".

The plural of the "hornstone" can be the "hornstones".

The singular of the "hornstone" can be the "hornstone".