ˌastrəˈfiˌlīt noun
( -s )
Etymology: International Scientific Vocabulary astr- + Greek phyllon leaf + International Scientific Vocabulary ite; originally formed as German astrophyllit — more at blade
: a mineral (K,Na) 2 (Fe,Mn)TiSi 4 O 14 (OH) 2 consisting of a basic silicate of potassium or sodium, iron or manganese, and titanium