Sphene
but you can call it Titanite as well because it gets parts of its color from the titane (Ti)
Sub-adamantine luster, Usually yellow, brown or green it’s a beautifull stone with a usual trichroism of yellow-greenich, reddy nearly incolor when playing with stone.
You can generally observ a High dispersion, a strong fire and facets dubbling effect.
Treatment: Brown/dark stone + Heat for orange and red colors
