Patent ID: 7439313

Claim:
A MgCl 2 .mEtOH.nH 2 O adduct, wherein 3.4≦m≦4.4 and 0≦n≦0.7, the adduct having an X-ray diffraction spectrum comprising at least one diffraction line at each diffraction angle 2θ of 9.3±0.2°and 9.9±0.2°with each diffraction angle being between 5°and 10°, the diffraction line at diffraction angle 2θ of 9.3±0.2° being more intense than the diffraction line at diffraction angle 2θ of 9.9±0.2°, and the diffraction line at diffraction angle 2θ of 9.9±0.2° being less than 0.4 times as intense as the diffraction line at diffraction angle 2θ of 9.3±0.2°.