Calcium carbonate
limestones
yes
Simple: The rock is a hard rock.
shells
Limestones are sedimentary rocks composed mostly of the mineral calcite. They typically form in shallow marine environments from the accumulation of calcareous remains of marine organisms like shells and coral. Limestones are soluble in acidic solutions and effervesce when in contact with acids like vinegar.
You can find limestones by defeating monsters in the /join quarry area in AdventureQuest Worlds. Keep battling monsters until they drop the limestones as loot. Good luck!
Limestone rocks make most dirtroads, but main roads like highways are made with asphalt.
Limestones are mostly made up of Calcite or Calcium Carbonate (CaCO3). Calcium Carbonate is basic in nature.
Rocks exposed in the Grand Canyon include limestones, cherts, shales, schists, sandstones, and granites.
fossils
A lodestone is a magnetized piece of rock. They are made of made of magnetite, a type of iron ore. For a piece of magnetite to be magnetic, it must be exposed to a magnetic field.
The stones used in the construction of Notre-Dame de Paris are limestones of various types, from the local area. (link)