picropharmacolite
Mineralogy
noun
A mineral of the monoclinic system that is a hydrated arsenate of calcium and magnesium, (Ca,Mg)3(AsO4)2·6H2O, occurring as colourless to white needles, incrustations, and concretions.
Origin
Early 19th century. After German Picro-pharmacolith; compare pharmacolite.