HEULANDITE-Ca (Ca0.5,Na,K,Sr0.5)9Al9Si27O72·~24H2O (monoclinic) . translucent pearly tabular crystals,characteristically coffin-shape. Maharashtra, India . 片沸石多作棺木狀（鑽石或獨木舟狀），玻璃或珍珠光澤，白色半透明． 多發生於玄武岩的孔穴中，與其它沸石類與方解石共生．
礦名來源：Named after the English mineral collector, John Henry Heuland (1778-1856), a British mineral collector and dealer.

經典名礦欣賞 ．２．３．４．５．６
NO.55