“Radiating clusters of stilbite-Ca crystals, with scattered individual crystals, within a fracture in gneiss. The radiating clusters were analyzed by SEM-EDS, see child photo for spectrum.”

“The radiating stilbite-Ca clusters were analyzed by SEM-EDS, conducted by Micromounters New England in 2018. The crystals have a calculated apfu of Na above 0.4, and so can be safely identified as stilbite-Ca.”