The degree of metamorphism. Phyllite is slate further metamorphosed.
Phyllite is a type of metamorphic rock that comes from adding heat, pressure, and/or chemically active fluids to slate. Slate is the parent, or originial, type of rock from which the phyllite forms. It could also be said that slate recrystallizes into phyllite. Slate is also a metamorphic rock that starts out as the sedimentary rock called shale. Therefore, phyllite comes from slate, which comes from shale. Phyllite is different from slate because it has been metamorphosed more. As a result, the straight lines/planes (called foliation) that slate breaks along, are absent in phyllite, which is distinctly wavy in appearance. If more metamorphism is applied to phyllite, it recrystallizes into schist.
Phyllite is a foliated metamorphic rock that is texturally intermediate between slate and schist. It exhibits a greater degree of metamorphism than slate but not as much as schist, resulting in a medium-grain texture with a glossy sheen.
The list that orders rocks in increasing grain size and increasing grade of metamorphism is: shale (fine-grained) - slate (fine-grained) - phyllite (medium-grained) - schist (medium to coarse-grained) - gneiss (coarse-grained).
Phyllite is a low-grade metamorphic rock that forms from the metamorphism of slate. It contains fine-grained minerals such as muscovite, chlorite, and quartz, giving it a distinct sheen from the alignment of its platy minerals.
The mineral common in schist and gneiss but not common in slate and phyllite is garnet. Garnet typically forms in higher-grade metamorphic rocks such as schist and gneiss due to the increased temperature and pressure conditions necessary for its formation.
Phyllite is metamorphosed slate, which is also a metamorphic rock. Shale or mudstone is the protolith (parent rock) of slate.
Phyllite is a type of metamorphic rock that comes from adding heat, pressure, and/or chemically active fluids to slate. Slate is the parent, or originial, type of rock from which the phyllite forms. It could also be said that slate recrystallizes into phyllite. Slate is also a metamorphic rock that starts out as the sedimentary rock called shale. Therefore, phyllite comes from slate, which comes from shale. Phyllite is different from slate because it has been metamorphosed more. As a result, the straight lines/planes (called foliation) that slate breaks along, are absent in phyllite, which is distinctly wavy in appearance. If more metamorphism is applied to phyllite, it recrystallizes into schist.
phyllite
If slate is sufficiently heated and compressed it becomes phyllite.
slate
yes, it's slate. it goes from shale to slate to phyllite to mica schist.
Slate has a smooth, fine-grained texture, characterized by its ability to break into thin, flat sheets due to its foliation. In contrast, phyllite has a slightly coarser texture than slate, often exhibiting a shiny or lustrous surface due to the presence of mica minerals, and it typically displays a wavy or crinkled appearance. Both rocks are metamorphic, but phyllite is formed under higher pressure and temperature conditions than slate.
Shale can metamorphose into slate, which can metamorphose into phyllite, which can metamorphose into schist, which can metamorphose into gneiss.
Phyllite is a foliated metamorphic rock that is texturally intermediate between slate and schist. It exhibits a greater degree of metamorphism than slate but not as much as schist, resulting in a medium-grain texture with a glossy sheen.
phyllite
- Amphibolite - Eclogite - Gneiss - Greenstone - Hornfels - Marble - Migmatite - Phyllite - Quartzite (Metaquartzite) - Schist - Slate - Soapstone
Slate is the low-pressure, low-temperature metamorphic rock whose parent rock (protolith) was shale. Clay minerals which were present in the shale have started to change into mica, a platy mineral, which give slate its cleavability. Because the transformation of the clay minerals is not complete, slate generally appears dull in light. With exposure to higher temperatures and pressures, shale will become the metamorphic rock phyllite. In phyllite, the transformation of the clay minerals to nearly visible micas and other minerals is nearly complete, giving the rock a very shiny appearance. It may also appear wavy and foliated. With higher temperature and pressure, phyllite will become the metamorphic rock schist.