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Meta Part 3

LINK TO FREE ROCK IMAGE ID KEY FOR EASY ROCK ID: https://rockpapa.github.io/Rock-Image... This is the final video in our metamorphism series, and in this one we tie everything together. Instead of focusing on just one rock type, we step back and look at the big picture—listing common igneous and sedimentary rocks and showing what they turn into under: Greenschist facies metamorphism Amphibolite grade metamorphism The goal here is simplicity: a clear summary you can remember, keep, and use when you’re out rock hunting or studying geology. 🌿 Greenschist Facies Metamorphism Greenschist metamorphism is all about hydration—adding water chemically to rocks. High-quartz rocks (like granite and sandstone) are very stable and show little to no change Low-quartz rocks show major changes: Shale → slate → phyllite → schist Basalt and andesite → greenstone → greenschist (with directed pressure) Ultramafic rocks like dunite and peridotite → serpentinite 🔥 Amphibolite Grade Metamorphism Amphibolite grade conditions involve higher temperature and pressure and generally less water. High-quartz rocks may develop metamorphic banding: Granite → banded gneiss Sandstone → quartzite Many quartz-rich rocks retain their original character and simply gain the prefix “meta-” Low-quartz rocks undergo more dramatic changes: Diorite → banded biotite–hornblende gneiss Gabbro and diabase → amphibolite Serpentinite may dehydrate back toward dunite and peridotite Schists begin to show indicator minerals such as garnet, staurolite, kyanite, and sillimanite These indicator minerals help tell us how intense the metamorphism was and what temperature-pressure conditions the rock experienced. 🧠 Big Takeaway Quartz-rich rocks are stable Low-quartz rocks are reactive Water, pressure, and temperature control everything This video wraps up the series and sets the stage for future episodes where we’ll focus more on before-and-after rock images to really lock these ideas in. If you found this helpful, please subscribe. And as always, thank you so much to all my wonderful subscribers—I appreciate you more than you know. Until next time, this is your Rock Papa saying: Happy rock hunting… Papa out. 🪨🚙