Hand specimen consisting of so-called “Harthauer Grünstein” (“Harthau Greenstone”, also referred to as “Harthau Chlorite Schist”), a metamorphic rock of the northern margin of the western part of the Erzgebirge (“Ore Mountains”), collected in the gravel bed of the Würschnitz River, near city of Chemnitz, central Saxony, East Germany. It is unclear which exact petrographic term following current standards should be applied to this piece of rock. Presumably, it represents a rock similar to Amphibolite.