Answer :
Final answer:
Non-foliated metamorphic rocks have a random grain texture, appearing massive and structureless, with examples including quartzite and marble, unlike foliated metamorphic rocks which have a layered or banded appearance.
Explanation:
The type of metamorphic rock that has a random grain texture is known as non-foliated metamorphic rock. In non-foliated metamorphic rocks, the mineral crystals do not exhibit any preferred alignment, resulting in massive and structureless appearance. . Nonfoliated rocks commonly appear massive and structureless, with only a few lines of impurities through the rock.
Examples of non-foliated metamorphic rocks include quartzite and marble.Examples of non-foliated metamorphic rocks include quartzite, which is medium to coarse grained and composed of interlocking quartz crystals, and marble, which is recognizable by its coarse crystalline texture and is often used in sculpture and as a building material. As opposed to non-foliated rocks, foliated metamorphic rocks, such as slate, phyllite, schist, and gneiss, have a characteristic banded or layered appearance due to the parallel alignment of mineral grains under high pressure and temperature conditions.
