You find an igneous rock that has large crystals of plagioclase feldspar health within a finegrained ground mass that is medium gray color. What kind of rock is it likely to be? What is the

name for this Texter and what does it tell you about how the rock formed - andesite

porphyry, porphyritic texture, 2-stage cooling history

Why do mafic magma's tend to reach the surface much more often than felsic magmas - they

are less viscous or more fluid

How would you distinguish on the basis of min...
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