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Titanite stones come in warm greenish yellows. Often you can see flashes of orange or red also residing in these stones.
This scientist was Marc August Pictet in 1787.
Yttrotitanite is a brown-black variety of titanite, otherwise known as keilhauite.
Actually, Sphene (also known as Titanite) has twice the refraction of diamonds. It is quite beautiful.
Diamonds.
The rarest color is bright apple green with flashes of the red, gold and orange fire.