A second-order reaction starts with an initial concentration of 0.100 mol/L of the reactant. If the rate constant is 2.6 × 10–2 L/mol·s, what is the time required to decrease the initial concentration to 0.050 mol/L? 2A → B rate = k[A]2

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).