It also occurs naturally in the form of the mineral cotunnite.
2.
CaH 2 crystallizes in the PbCl 2 ( cotunnite ) structure.
3.
As a sublimate it occurs with copper chlorides, alkali chlorides and cotunnite.
4.
Titanium dioxide has eight modifications in addition to rutile, anatase, and brookite, three metastable phases can be produced synthetically ( tetragonal and orthorombic ), and five high-pressure forms ( ?-PbO 2-like, baddeleyite-like, cotunnite-like, orthorhombic OI, and cubic phases ) also exist:
मोबाइल