enigmatite
noun
enig·ma·tite
variants or less commonly aenigmatite
ə̇ˈnigməˌtīt,
ēˈ-,
eˈ-
plural -s
: 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 (specific gravity 3.74–3.80)
Word History
Etymology
German ainigmatit, änigmatit, from Greek ainigmat-, ainigma + German -it -ite