What rocks can schist turn into?
At that point the rock can be called a “phyllite.” When the platy mineral grains have grown large enough to be seen with the unaided eye, the rock can be called “schist.” Additional heat, pressure, and chemical activity might convert the schist into a granular metamorphic rock known as “gneiss.”
Can any rock become an igneous rock?
Sedimentary rock can change into metamorphic rock or into igneous rock. Metamorphic rock can change into igneous or sedimentary rock. Igneous rock forms when magma cools and makes crystals.
Can schist become Shale?
Schist can become shale in the much the same way that granite can become shale. It can be melted as the result of increased pressure and/or temperature, first transforming the schist to gneiss and then migmatite and enough partial melting can generate magma of silicic composition.
Why is schist a metamorphic rock?
Schist is medium grade metamorphic rock, formed by the metamorphosis of mudstone / shale, or some types of igneous rock, to a higher degree than slate, i.e. it has been subjected to higher temperatures and pressures. These larger crystals reflect light so that schist often has a high lustre, i.e. it is shiny.
How does schist undergo metamorphism?
Schist – The size of the mineral grains tends to enlarge with increasing grade of metamorphism. Eventually the rock develops a near planar foliation caused by the preferred orientation of sheet silicates (mainly biotite and muscovite). The irregular planar foliation at this stage is called schistosity.
What kind of rock is a schist made of?
Schist is faliated medium grade metamorphic rock. It formed by metamorphosis of mudstone and shale or some form of igneous rock. It usually has better crystallisation of mica minerals.
What are the different types of schistose metamorphic rocks?
Varieties of schistose metamorphic rocks: 1. Mica schist with porphyroblasts of garnet, staurolite and kyanite. 2. Graphite schist. 3. Chlorite schist (greenschist). 4. Quartzofeldspathic (gneissic) schist. 5. Staurolite schist with a twinned staurolite porphyroblast. 6. Blueschist (glaucophane schist with garnet and omphacite).
How is a schist different from a paraschist?
If all that is known is that the protolith was a sedimentary rock, the schist will be described as a paraschist, while if the protolith was an igneous rock, the schist will be described as an orthoschist. Mineral qualifiers are important when naming a schist.
How is schist used in the real world?
Schist Uses It is used in building houses or walls. Because of it is strong and durable. It has been previously used to make decorative rock walls.