aragonite sputnick specimen
|Composition||calcium carbonate, CaCO3|
Aragonite was named by Abrahan Gottlieb Werner after Molina de Aragón, Spain, where this mineral was first described in 1788. This is the major place where the Star Cluster type are found.
Deposits of Aragonite have been found in Britain, Spain, Mexico and Namibia.
This is a carbonate mineral, one of the two most common, naturally occurring, crystal forms of calcium carbonate, CaCO3 (the other form being the mineral calcite). It is formed by biological and physical processes, including precipitation from marine and freshwater environments.
Calcium carbonate forms as both Aragonite and Calcite and these two minerals only differ in their crystallisation. Calcite, the more common mineral, forms in trigonal crystals, whereas Aragonite forms orthorhombic crystals. On occasion, crystals of both minerals are too small to be individually determined, and it is only possible to distinguish these two minerals with optical or x-ray testing. The true identity of microcrystalline forms of each may also not be known without complex testing, and this can also cause a confusion between these speci