In the 1990s, Eric Middle
In the 1990s, Eric Middlemost argued that this group could best be classified using chemical means, showing the importance of the TAS diagram, though the QAPF diagram can be used if one has more compositional information. Miariolitic cavities can form in a type known as pegmatite, and the textures of these rocks are usually either (*) phaneritic or aphanitic, depending whether they are formed intrusively below the crust or extrusively above it. Mafic rocks are a dark green subset of this class, examples of which include basalt and granite. For 10 points, name these types of rocks created from volcanic action, which are neither metamorphic nor sedimentary.
In the 1990s, Eric Middlemost argued that this group could best be classified using chemical means, showing the importance of the TAS diagram, though the QAPF diagram can be used if one has more compositional information.
{igneous} rocks