The most usual protolith of slate is the sedimentary rock shale.
A metamorphic rock.
Blackboards are typically made of a type of rock called slate. Slate is a fine-grained metamorphic rock that is easily split into thin, smooth sheets, making it ideal for writing on with chalk.
Slate is fine sedimentary mud that has been subjected to immense pressure over a very long time.
Slate is a natural product found in the ground. A type of rock.
Slate rock has a fine-grained texture, with individual mineral grains that are too small to be seen with the naked eye. This gives slate a smooth and dense appearance.
A metamorphic rock.
slate
Sedimentary rock, such as limestone, chalk, slate and sandstone.
It tuns into slate when matamorphosed.
Slate rock is a type of metamorphic rock, which forms from the alteration of shale or mudstone. The age of slate rock can vary, but typically it is formed millions of years ago through heat and pressure in the Earth's crust. So, slate rock as a material can be considered quite old in geological terms.
no slate is an igneous rock
Shale is a sedimentary rock, not a metamorphic rock.