Consider the following unbalanced redox reaction:

mno4- (aq) + sbh3 (aq) > mno2 (s) + sb (s)

what is the oxidizing agent in the reaction?

a.) mno4-

b.) sbh3

c.) mno2

d.) sb

?

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).