F-rich richterite from the Hydro quarry, Fen complex, Southern Norway: crystallographic data and crystal-chemistry

We present in this paper the crystal-chemical (EMP analysis and single-crystal structure refinement, SREF) description of a sample of blue amphibole collected in 2012 in the Hydro quarry (neighbour to the Cappelen quarry) by one of the authors (KEL). According to the current IMA amphibole nomenclature (Hawthorne et al. 2012), it is classified as F-rich richterite.