The concentration of Nations in seawater, 0.481 M, is higher than in the cytosol, the fluid inside human cells
(12 mM). How much water must be added to 1.50 mL of
seawater to make the Na* ion concentration equal to that found in cytosol? Assume the volumes are additive.

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).