The limestone White Cliffs of Dover, cave stalactites, and pearls are among naturally occurring forms of calcium carbonate \(\left(\mathrm{CaCO}_{3}ight)\). Aragonite is one of the minerals found in limestone. It has an orthorhombic lattice with all angles \(90^{\circ}\) and with measured axes

What are the axes of its reciprocal lattice?

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a = 0.50 nm b = 0.80 min c = 0.57 nm.