Slate

ardósia

(piece of such stone used as a tile for flooring, roofing, etc.; such tiles collectively; material from which they are made)

ardósia

(piece, originally of certain types of stone and now of other materials, often in a frame, used for writing on)

ardósia

(fine-grained homogeneous sedimentary rock)

conta

(record of money owed)

lousa

(piece, originally of certain types of stone and now of other materials, often in a frame, used for writing on)