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Aragonite is a calcium carbonate mineral (like limestone) that comes from seashells, such as oyster shell. It is used in lieu of lime in situations where the soil is already high in magnesium, and where dolomite (high magnesium limestone) is the only liming material available. Aragonite has approximately 94-97 percent of the neutralizing value of CaCO3. Applications should be made in accordance with a soil test.
Aragonite is also used to protect newly planted bulbs from damage caused by moles, mice, chipmunks, and squirrels. Aragonite is used as a soil conditioner and feed suppliment and is not registered as a fertilizer.