Formation and Nature of Pearl: Pearl is secreted by the mantle of the pearl oyster as a protection against foreign objects which may be sand particles, minute larval forms or other such things. To study the mode of formation of pearl it is essential to know the structure of the shell and mantle.
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Limestone is a sedimentary rock composed largely of the minerals calcite and/or aragonite, which are different crystal forms of calcium carbonate (CaCO3).Edit. Share to: 1  Backyard Designs: How to Build an Outdoor Fire Pit There's nothing quite like the crackle and glow of a fire that speaks to our primitive nature.imestone is chemical; though in certain cases, limestone may be organic, when it is composed of the dead remains of organisms (fossils). That's called fossiliferous limestone â¦ , or fossil-rich limestone, but regular limestone is just chemical. 7 people found this useful.