nice Bi-color Tourmaline lot
origin: I think from Pakistan due to high saturated color. Brazilian is more intense ??
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
