Scandium is found in the Earth's crust, 2-25 ppm (w/w), in the mineral such as thortveitite, davidite, ytterbite, orthite and cerrite . The isotope found in nature is 45Sc (100%, stable) .*) Inconclusive data.
In pure form, scandium occurs in the following crystal forms:
α-form: Hexagonal close-packed crystal 
β-form: face-centered cubic*)