You can determine because there is texture differences. Also, foliated rocks have visible layers or elongated grains of minerals. Nonfoliated does not have distinct layers or bands.
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A foliated rock will have mineral grains aligned in layers or bands, giving it a striped appearance. In contrast, a nonfoliated rock will have a more uniform texture without visible layers. One way to determine if a rock is foliated or nonfoliated is by examining its texture and observing whether it exhibits a banded structure.
Gabbro is a nonfoliated rock, meaning it does not have a layered structure like foliated rocks such as slate or schist. Gabbro is a coarse-grained, intrusive igneous rock composed mainly of pyroxene, plagioclase feldspar, and sometimes olivine.
Conglomerate rock is nonfoliated, meaning it does not have a layered or banded structure typically found in foliated rocks like schist or slate. Conglomerate forms when rounded gravel and pebbles are cemented together, creating a clastic sedimentary rock.
Sandstone is classified as a nonfoliated rock because it does not exhibit any cleavage or foliation due to its uniform grain size and lack of alignment of mineral grains.
Pumice is a nonfoliated volcanic rock that is highly porous and is formed from frothy lava with trapped gas bubbles that cool rapidly and harden. It does not have a layered or banded structure like foliated rocks such as schist or gneiss.
Breccia is typically a nonfoliated rock, meaning that it lacks the aligned mineral grains or bands characteristic of foliated rocks. Breccia forms from the cementation of broken rock fragments, giving it a distinct angular appearance.