Phillipsite-K, Ettringite
(K,Na,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] . 12H2O, Ca6Al2(SO4)3(OH)12·26H2OÂ
Locality:
Vallerano Quarries, Valleranello, Rome, Rome Province, Latium, Italy Â
Largest Crystal Size: 1 mm
Colorless and transparent prismatic crystals of Phillipsite-K grown in the midst of sprays of small colorless, hexagonal prismatic crystals of ettringite. The matrix is a metamorphosed nodule.
 Collection and photo by Gianfranco Ciccolini Â













