Seed crystals, method of producing seed crystals, method of producing seed crystals attachment support, and method of producing zeolite membrane complex

A method of producing seed crystals of zeolite which is to be attached onto a support in production of a zeolite membrane complex comprising said support and a zeolite membrane formed on said support, comprising:

• a) producing zeolite by hydrothermal synthesis and acquiring original crystals from said zeolite;
• and
• b) pulverizing said original crystals, to thereby form seed crystals in which the specific surface area is not smaller than 10 m2/g and not larger than 150 m2/g and the strength obtained from a crystal component at a diffraction angle 2θ indicating a maximum peak in a range of diffraction angle 2θ from 12° to 25° in an X-ray diffraction pattern obtained by emitting X-ray to said seed crystals is not less than once and not more than 30 times that obtained from an amorphous component.