noun
also ae·nig·ma·tite ə̇ˈnigməˌtīt, ēˈ-, eˈ-
( -s )
Etymology: German ainigmatit, änigmatit, from Greek ainigmat-, ainigma + German -it -ite
: an imperfectly known mineral formerly classed with the amphibole group that occurs in black triclinic crystals and is essentially a silicate of iron, titanium, and sodium (sp. gr. 3.74-3.80)