The question is: what mineral precipitates first when forsterite dissolves congr

Question

The question is: what mineral precipitates first when forsterite dissolves congruently in water having the composition of point P in the figure.

cive Sol lines ,,..nsely, when thes a a solution i si the diagram piolite, or an eRnes, dependin solubiy ne is reached tion. Corsequently, these stable mirerals in contac solutions on the surface The combination of solu reprecipitation causes t ment of forsterite, ensta anthophyllite by magne tine, sepiolite, or amor amorphous silica preci ters i left serp ica p +18S l Brucite +16 10 ,pentin Forsterite Natural solutions if one of the more solu continues to dissolve, t of the solution rises ur coprecipitates with sil initial precipitation of eventually result in th serpentine, provided H SiO, increases suft - +10 Mg2+, H+, H,Sio, Silica 8 -6 4 0 log [H,SiO4]

Explanation / Answer

Forsterite dissolves congruently until the dissolve concentration of silica and and magnesium ion reach to the critical value at which new mineral is precipitated.

The mineral should be amorphous and not be a crystalline. Crystallinity increases with time.

Hence talc with formula Mg6Si8O20(OH)4 will precipitate first, later on chrysotile, siderite, brucite will form respectively.

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