Which of the following is a type of nonfoliated metamorphic rock. a. slateb. gneissc. phyllited. quartzite

d.quartzite

Explanation:

Generally, metamorphic rock formation begin in the earth's interior . The changes affects the texture, mineral constituents or both. Usually, the transformation occurs in the solid state . Temperature , pressure and stress plays a major role in the formation of metamorphic rocks. A typical example of a metamorphic rock is marble . Marble is formed from it parent rock, limestone .

Considering texture, metamorphic rock can be classified as Nonfoliated and Foliated.

A metamorphic rock is said to be foliated when it has a planar texture.  

All the other rocks have a planar texture except for quartzite which is hard as a single quartz crystal and is difficult to crush or break. That is the picture  of a quartz