An unzoned mineral that is usually zoned at lower-medium metamorphic grades has both experienced superior temperature conditions or was never zoned (owing to a simple response background at constrained P-T or to growth solely at large-T). Reaction textures Some metamorphic rocks comprise proof for incomplete reactions or other textural proof for Element of the P-T route. A straightforward example will be the partial substitution of andalusite by sillimanite (Fig. 6a) with the polymorphic transformation of andalusite to sillimanite. Textural proof may also be practical in instances in which the reactants are totally eaten if The form of a number of reactants are preserved; such as, pseudomorphs (Figs. 6b-d). An illustration of a more complicated reaction texture involves the development of coronas , which consist of a number of shells (rims, moats) of the mineral or minerals all-around a central (reactant) section (Fig. 6e). In many circumstances, coronas also entail the wonderful-scale intergrowth of minerals in the texture known as symplectite (Figs. 6e-f).
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