Which of the following metamorphic rocks doesn’t have foliated structure?

✅ Explanation:
Rock: Rocks are mineral aggregates with a combination of properties of all the mineral traces.
Types of Rocks
-Igneous Rocks
-Sedimentary Rocks
-Metamorphic Rocks
Igneous Rocks: Igneous rock is formed through the cooling and solidification of magma or lava. Igneous Rocks may form with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.

• Types of Igneous Rock:
Intrusive igneous rock: These rocks crystallize below the earth’s surface resulting in large crystals as the cooling takes place slowly. Diorite, granite, pegmatite are examples of intrusive igneous rocks.Extrusive igneous rock: These rocks erupt onto the surface resulting in small crystals as the cooling takes place quickly. The cooling rate is for a few rocks is so quick that they form an amorphous glass. Basalt, tuff, pumice are examples of extrusive igneous rock.
Sedimentary Rock: The sedimentary rocks are formed by the deposition and subsequent cementation of that material within bodies of water and at the surface of the earth. The process that causes various organic materials and minerals to settle in a place is termed sedimentation.

• Types of Sedimentary Rock:
Clastic sedimentary rocks: These rocks are formed from mechanical weathering debris. Sandstone, siltstone are examples of clastic sedimentary rocks.Chemical sedimentary rocks: These rocks are formed from the dissolved materials that precipitate from the solution. Iron ore, limestones are examples of chemical sedimentary rocks.Organic sedimentary rocks: These rocks are formed from the accumulation of plant and animal debris. Coal, some dolomites are examples of organic sedimentary rocks.
Metamorphic Rock: Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means “change in form”. The original rock is subjected to heat with temperatures greater than 150 to 200°C and pressure around 1500 bars, causing profound physical and/or chemical change.

• Types of Metamorphic Rock:
Foliated metamorphic rocks: These rocks are produced by exposure to heat and pressure which makes them appear layered. Phyllite, gneiss are examples of foliated metamorphic rocks.Non-foliated metamorphic rocks: These rocks don’t have layers. Marble, quartzite are examples of non-foliated metamorphic rocks.