Titanium is found in the Earth's crust, 0.63 % (w/w), in the minerals rutile, ilmenite, perovskite, anatase/octahedrite, brookite, sphene/titanite and benitotite . The isotopes found in nature are 46Ti (7.93 %, stable), 47Ti (7.28 %, stable), 48Ti (73.94 %, stable), 49Ti (5.51 %, stable) and 50Ti (5.34 %, stable) .
In pure form, titanium occurs in the following crystal forms:
α-form: Hexagonal crystal at < 882.5 °C 
β-form: Body-centered cubic at > 882.5 °C