A method for preparing a composition comprising silicate mineral particles which have colouring properties, wherein: - a composition, named talcose composition, comprising phyllosilicate mineral particles is chosen from the group formed of: ▪ particles formed of a stack of elementary lamellae and having the chemical formula: (Si x Ge 1- x) 4 M 3 O 10 2 - M denoting at least one divalent metal and having the formula Mg y Co y Zn y Cu y Mn y Fe y Ni y Cr y; 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], ▪ 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: (Si x Ge 1-x) 4 M 3-ε O 10 2, (M' m+) ε' • nH 2 O - M denoting at least one divalent metal and having the formula Mg y Co y Zn y Cu y Mn y Fe y Ni y Cr y; 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 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, - said talcose composition is brought into contact with a solution, named colouring solution, comprising cations, named colouring cations, of at least one element chosen from the transition metals, the lanthanides and the actinides, in order to obtain a talcose composition comprising coloured silicate mineral particles. - a composition, named talcose composition, comprising phyllosilicate mineral particles is chosen from the group formed of: ▪ particles formed of a stack of elementary lamellae and having the chemical formula: (Si x Ge 1- x) 4 M 3 O 10 2 ▪ particles formed of a stack of elementary lamellae and having the chemical formula: (Si x Ge 1- x) 4 M 3 O 10 2 - M denoting at least one divalent metal and having the formula Mg y Co y Zn y Cu y Mn y Fe y Ni y Cr y; 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], ▪ 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: (Si x Ge 1-x) 4 M 3-ε O 10 2, (M' m+) ε' • nH 2 O ▪ 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: (Si x Ge 1-x) 4 M 3-ε O 10 2, (M' m+) ε' • nH 2 O - M denoting at least one divalent metal and having the formula Mg y Co y Zn y Cu y Mn y Fe y Ni y Cr y; 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 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, - said talcose composition is brought into contact with a solution, named colouring solution, comprising cations, named colouring cations, of at least one element chosen from the transition metals, the lanthanides and the actinides, in order to obtain a talcose composition comprising coloured silicate mineral particles.