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![There's plenty of fish in the OceanA mineral fish is a pleasant structure that can be found in sheared rocks (i.e. rocks in which one side slid past the other). When rocks are deformed this way, some platy minerals - like biotite in this case - get stretched and develop a sigmoidal, fish-like shape, that it is very useful because it tells us the sense of shear of the rock.Geologists look at this kind of structures to reconstruct the sense of movement of past shear zones (i.e. the 'roots' of fault zones that can be found in metamorphic rocks). Without any further explanation, can you tell the sense of movement of this shear zone? ☺️🔬 [1] CPL | NX [2] PPL | N// (slide)⇔ 3 mm⛏ Mylonitic granite🕑 Miocene🧭 Isle of Elba, Italy© GW#geology #thinsection #granite #mylonite #micafish #mineralfish #kinematicindicator #tectonics #structuralgeology #shearzone #deformation #metamorphism #geologyistheway #geologyrocks #geologylife #geologystudent #rocks #fault #elba #elbaisland #italy #geologia #geologie #nature #gonefishing](https://geologyistheway.com/wp-content/plugins/instagram-feed/img/placeholder.png)
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