Sphene from the Greek sphenos meaning wedge. Sphene also know as titanite. Titante can be changed to orange or red through heating. The International Mineralogical Association Commission on New Minerals and Mineral Names (CNMMN) adopted the name titanite and 'discredited' the name sphene as of 1982, although commonly papers and books initially identify the mineral using both names. Sphene was the most commonly used name until the IMA decision. It has a refractive index of 1.842-2.110 and a mohls hardness of 5-5.5