am·blyg·o·nite 
(ăm-blĭgə-nīt′)
(ăm-blĭgə-nīt′)n.
A white or greenish mineral, (Li,Na)Al(PO4)(F,OH), that is an important source of lithium.
[German Amblygonit, from Greek amblugōnios, obtuse-angled : amblus, blunt; see mel-1 in the Appendix of Indo-European roots + gōniā, angle; see genu-1 in the Appendix of Indo-European roots.]