noun
Refers to the metamorphic rock used for roofing, writing surfaces, and other purposes. Also used in compound terms like スレート屋根 (slate roof).
この家の屋根はスレートでできている。
The roof of this house is made of slate.
昔の学校では、スレートに石筆で字を書
In old schools, they wrote on slates with slate pencils.