Akademik
sphene
\\ˈsfēn\
noun
(
-
s
)
Etymology:
French
sphène,
from Greek
sphēn
wedge
;
from
a form of its crystals
:
a mineral CaTiSiO
5
that is a silicate of calcium and titanium, and often contains columbium, chromium, fluorine, and other elements
— called also
titanite
Useful english dictionary
.
2012
.