An unzoned mineral that is often zoned at low-medium metamorphic grades has both experienced superior temperature disorders or was never ever zoned (owing to a straightforward response record at limited P-T or to development totally at superior-T). Response textures Some metamorphic rocks comprise evidence for incomplete reactions or other textural evidence for Section of the P-T route. A simple illustration will be the partial substitute of andalusite by sillimanite (Fig. 6a) via the polymorphic transformation of andalusite to sillimanite. Textural evidence may additionally be beneficial in conditions the place the reactants are already totally eaten if The form of a number of reactants are preserved; by way of example, pseudomorphs (Figs. 6b-d). An example of a more advanced response texture will involve the formation of coronas , which include one or more shells (rims, moats) of a mineral or minerals all-around a central (reactant) section (Fig. 6e). In several scenarios, coronas also require the fantastic-scale intergrowth of minerals inside of a texture often known as symplectite (Figs. 6e-file).
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