Besides a crystal of the nesosilicate forsterite Mg2SiO4 from Pakistan. M56 Sorosilicate, disilicate monoclinic, prismatic crystals of the sorosilicate thortveitite Sc2Si2O7 in pegmatite. From Routevaare, Jokkmokk in northern Sweden. From the collection of Fredrik Grensman. M57 A mineral with sorosili- cate character monoclinic crystals of blackish-green epidote. It is a complicated mineral with the formula Ca2(Fe,Al) Al2(O,OH,SiO4,Si2O7). It has the character of a sorosilicate. In the picture also white calcite, calcium carbonate, is shown.