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RATINGS: Sites are rated from 1 owl (good) to a high of 5 owls. Read more- Illustrations of Metamorphic Rocks
Okay, so metamorphic rocks can be classified by texture and grain size. But what exactly do these textures and grains look like? This college webpage has big, bold, and beautiful — sure, rocks can be beautiful — pictures of a variety of metamorphic rocks, each with an accompanying explanation of the descriptive terms used to classify it.
- Metamorphic Rock Identification
What forces make metamorphic rocks? The same forces that make students sweat bullets and choke on tests: heat and pressure. With rocks though, the temperature's much higher, and the pressure is physical, not psychological. This university website delves into the creation of and classification of metamorphic rock. Click on "I'm ready to identify METAMORPHIC ROCK" to follow a step-by-step process for doing so.
Slate Slate formation and uses are explained here.
- North Cascades Geology: Metamorphic Rocks
Squeeze shale to make slate, squeeze slate (harder) to make phyllite, squeeze phyllite (even harder) to make schist, then squeeze schist harder still to make gneiss. That, in simple terms, is progressive metamorphism. This USGS website characterizes metamorphic rock in general and describes what happens to shale and basalt as Earth puts the squeeze on them.Progressive Metamorphism of Basalt The town of Concrete
- Foliated and Nonfoliated Metamorphic Rock
Squashing a stack of bread makes a foliated structure. Squashing a slice of bread into a ball makes a nonfoliated structure. Of course, this USGS webpage is about the wonder of geology, not bread, so all discussion of squashing is limited to metamorphic rock.
Metamorphism: Changed Rocks
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