DetailsAmphibolite is a metamorphic rock consisting mainly of amphibole, especially the species hornblende & actinolite. They can be derived from either the metamorphism of mafic rocks or poorly sorted sedimentary protoliths. Closer inspection of the locality is needed to determine the origin. This particularly attractive example from southern Norway has highly prominent garnet porphyroblasts & the nickname "cherry cake". Specimens are supplied in labelled card trays.