An unzoned mineral that is often zoned at lower-medium metamorphic grades has either professional significant temperature situations or was by no means zoned (owing to a straightforward response background at confined P-T or to development fully at large-T). Reaction textures Some metamorphic rocks comprise proof for incomplete reactions or other textural evidence for Element of the P-T route. A simple case in point may be the partial substitute of andalusite by sillimanite (Fig. 6a) via the polymorphic transformation of andalusite to sillimanite. Textural proof may additionally be helpful in scenarios the place the reactants happen to be wholly eaten if the shape of a number of reactants are preserved; by way of example, pseudomorphs (Figs. 6b-d). An example of a far more sophisticated response texture entails the development of coronas , which include one or more shells (rims, moats) of the mineral or minerals about a central (reactant) section (Fig. 6e). In lots of cases, coronas also require the good-scale intergrowth of minerals in a texture generally known as symplectite (Figs. 6e-f).
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