Patent ID: 8444946

Claim:
A method for preparing a talcose composition comprising synthetic mineral particles which have a crystalline and lamellar structure; and are of formula: (Si x Ge 1−x ) 4 M 3 O 10 (OH) 2 , wherein M is at least one divalent metal and is of formula Mg y(1) Co y(2) Zn y(3) Cu y(4) Mn y(5) Fe y(6) Ni y(7) Cr y(8) ; each y (i) being a real number of the interval [0; 1], such that ∑ i = 1 8 ⁢ y ⁡ ( i ) = 1 , x is a real number of the interval [0; 1], said method comprising: carrying out a hydrothermal treatment of a gel in the liquid state of the formula: (Si x Ge 1−x ) 4 M 3 O 11 ,n′H 2 O, M is at least one divalent metal and is of formula Mg y(1) Co y(2) Zn y(3) Cu y(4) Mn y(5) Fe y(6) Ni y(7) Cr y(8) ; each y (i) being a real number of the interval [0; 1], such that ∑ i = 1 8 ⁢ y ⁡ ( i ) = 1 , x is a real number of the interval [0; 1], n′ refers to a number of water molecules associated with said gel; said hydrothermal treatment is carried out for a period of time and at a temperature, of from 300° C. to 600° C., that are chosen according to the particle size and structural stability desired for the mineral particles that are to be prepared.