Patent ID: 7811652

Claim:
A formed article of cordierite, the cordierite comprising: a plurality of domains; and a plurality of crystal grains placed in each domain to form a domain structure, wherein a raw material for the cordierite is macro-crystal talc, the macro-crystal talc has a diffraction peak at each of a (006) crystal lattice plane, a (111) crystal lattice plane and a (132) crystal lattice plane in an X-ray diffraction, a first ratio of an intensity of the diffraction peak at the (111) crystal lattice plane to an intensity of the diffraction peak at the (006) crystal lattice plane is lower than 0.1, a second ratio of an intensity of the diffraction peak at the (132) crystal lattice plane to an intensity of the diffraction peak at the (006) crystal lattice plane is lower than 0.1, the crystal grains in each domain are substantially aligned in the same direction, and an average size of the domains ranges from 40 μm to 150 μm.