Which is a feature of a single replacement reaction?
a. substance xyz breaks down into x and yz.
b. substance g reacts with compound xy to form gy and x.
c. substance x burns rapidly in the presence of oxygen.
d. substance qr and gt exchange ions with each other.

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).