Question

What is nonfoliated texture? Give an example of a rock that serves as an example.

a. A rock with a nonfoliated texture, such as quartzite, has a layered or banded appearance.
b. A rock with a nonfoliated texture, such as garnet-mica schist, contains some unusually large grains that are surrounded by a fine-grained matrix of other minerals.
c. A rock with a nonfoliated texture, such as gneiss, does not display a layered or banded appearance.
d. A rock with a nonfoliated texture, such as gneiss, has a layered or banded appearance.
e. A rock with a nonfoliated texture, such as marble, does not display a layered or banded appearance.

Answer 1

Nonfoliated texture in metamorphic rocks indicates a uniform, massive appearance without layers or banding. Rocks like quartzite and marble are examples of nonfoliated metamorphic rocks, characterized by their uniform grain orientation and appearance.

Step-by-step explanation:

A nonfoliated texture in metamorphic rocks indicates that the mineral grains do not have any preferred directional alignment and often appear massive and uniform, lacking any layers or banding. An example of a rock with a nonfoliated texture is quartzite, which is medium-grained and lacks any foliation. Another example is marble, which can be coarse-grained and also nonfoliated.

Nonfoliated rocks, such as quartzite and marble, break across the mineral grains rather than around them, which often gives them a scalier surface as opposed to the smooth planes commonly seen in foliated rocks. The appearance of nonfoliated rocks is generally uniform in all directions and lacks structure such as bands or stripes of different colors.