ˈerēəˌnīt noun
( -s )
Etymology: Greek erion wool + English -ite — more at erineum
: a mineral NaKCaAl 4 Si 12 O 32 .12H 2 O consisting of zeolitic aluminosilicate of sodium, potassium, and calcium occurring in aggregates of orthorhombic fibrous white crystals resembling wool (sp. gr. 2)