Method for preparing a composition comprising coloured silicate mineral particles and a composition comprising coloured silicate mineral particles

A method for preparing a composition comprising silicate mineral particles which have coloring properties, wherein:

• a talcose composition, comprising phyllosilicate mineral particles is selected from the group consisting of:
• particles formed of a stack of elementary lamellae and having the chemical formula:
• (SixGe1-x)4M3O10(OH)2
• M denoting at least one divalent metal and having the formula Mgy(1)Coy(2)Zny(3)Cuy(4)Mny(5)Fey(6)Niy(7)Cry(8);
• each y(i) representing a real number of the interval [0;
• 1], and such that
• ∑
• i
• =
• 1
• 8
• ⁢
• y
• ⁡
• (
• i
• )
• =
• 1
• ,
• x being a real number of the interval [0;
• 1], and
• particles formed of a stack of elementary lamellae and having at least one interfoliar space between two consecutive elementary lamellae and having the chemical formula:
• (SixGe1-x)4M3-ε O10(OH)2,(W′M+)ε′.nH2O
• M denoting at least one divalent metal and having the formula Mgy(1)Coy(2)Zny(3)Cuy(4)Mny(5)Fey(6)Niy(7)Cry(8);
• each y(i) representing a real number of the interval [0;
• 1], and such that
• ∑
• i
• =
• 1
• 8
• ⁢
• y
• ⁡
• (
• i
• )
• =
• 1
• ,
• M′m+denoting at least one cation, named an interfoliar cation, present in at least one interfoliar space of said elementary lamellae,
• x being a real number of the interval [0;
• 1],
• ε being a real number of the interval [0;
• 3[ and denoting a cation deficit of said elementary lamellae,
• ε′ being a real number of the interval [0;
• 3[ and denoting a proportion of interfoliar cation(s) M′m+ present in the interfoliar space(s) of said elementary lamellae,
• m being a real number of the interval [1;
• 3] and denoting a cation charge of the cation M′m+,
• n referring to a number of molecule(s) of water associated with said particles,
• said silicate mineral particles having a thickness of less than 100 nm and the largest dimension of which is less than 10 μm, bringing said talcose composition into contact with a solution, named a coloring solution, comprising cations, named coloring cations, of at least one element chosen from the transition metals, the lanthanides and the actinides, in order to obtain a talcose composition comprising colored silicate mineral particles.