The Probert Encyclopaedia of Rocks & Minerals

ARAGONITE

Aragonite (named from Aragon in Spain) is a mineral identical in composition with calcite or carbonate of lime, but differing from it in its crystalline form and some of its physical characters. It forms easily in a sedimentary environment but only stable in metamorphic rocks formed at high temperatures. It has the formulae CaCO3 and a relative hardness of 4.
Research Aragonite