
1) Oxide mineral
Found on
https://www.crosswordclues.com/clue/leucoxene

Leucoxene is a fine granular alteration product of titanium minerals. It varies in color from yellow to brown. It consists mainly of rutile or anatase. It is observed in some igneous rocks and iron ore deposits as the result of the alteration of ilmenite, perovskite, or titanite. ...
Found on
http://en.wikipedia.org/wiki/Leucoxene

• (n.) A nearly opaque white mineral, in part identical with titanite, observed in some igneous rocks as the result of the alteration of titanic iron.
Found on
http://thinkexist.com/dictionary/meaning/leucoxene/
Leu·cox'ene (lu*kŏks'ēn)
noun [
Leuco- + Greek
xe`nos stranger.]
(Min.) A nearly opaque white mineral, in part identical with titanite, observed in some igneous rocks as the result of the alteration of titanic iron.
Found on
http://www.encyclo.co.uk/webster/L/33

Leucoxene is a nearly opaque white mineral, in part identical with titanite, observed in some igneous rocks as the result of the alteration of titanic iron.
Found on
http://www.probertencyclopaedia.com/browse/HL.HTM
No exact match found.