Lazurite ( (Na,Ca)8 (Al,Si)12O24(S,SO)4 ), is one of a number of related feldspathoid minerals, which occur in silica-poor igneous rocks collectively termed the Sodalite Group. Also part of the group are nosean (or noselite) along with a clacium-bearing type named Haüyne.
Sample of Haüyne from Mayen, Eifel Mountains, Rhineland-Palatinate, Germany. Attribution: Rob Lavinsky, iRocks.com
Lazurite is a [...]