Which statement is true about ionic compounds?
they are made up of many large molecules that are bonded together,
they are made up of atoms of only one type of element.
they are made up of particles that are arranged in a repeating pattern
they are made up of a random ratio of elements that are bonded toge

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).