1) Calcium mineral 
Pelagosite is a form of pisolitic aragonite (CaCO3) whose type locality is the Croatian island group of Palagruža (Italian Pelagosa, whence the name) in the middle of the Adriatic. It was identified by R. Moser in Mineralogische und petrographische Mitteilungen, new series (Vienna) 1 (1878), 174. It has a higher content of magnesium carbonate, st...