The answer is Slate. It is similar to Shale. It is still used but much less than 80 years ago.
Slate is used in upscale roofing applications.
.sandstone
.granite
.slate
.marble
Slate is a mineral. It is used for roofs in the UK and Ireland. Mediterranean roofs are often made of clay tiles. In the US, asphalt shingles are common.
Slate is used in some countries to make roofs. Some use thatch. Others use tar or shingles.
A rock called slate.
Slate
Slate.
Slate
A foliated metamorphic rock is slate, which is used for roofing and flooring, but chalkboards are made of porcelain enamel (man made)
slate, it is also used in roofing
rock slate is in irregular shape it is gray in color when formed. It is used for many things likein building roofing & floor tiles.
Slate is a very hard but brittle sedimentary rock. It is mainly used as roofing tiles.
Slate
granite is your answer
slate
Slate
It has been, but limestone is prone to weathering, and is easily damaged by air pollution.
LEAD
Sedimentary rock: Limestone can be used as a building material, or fired in a kiln to produce powdered lime for scattering on a farmer's field. Sandstone can be used as a building material. Slate can be used as a roofing material and a building material.
It was a divot.
A foliated metamorphic rock is slate, which is used for roofing and flooring, but chalkboards are made of porcelain enamel (man made)
An argillite is a fine-grained sedimentary rock, sometimes used as a building material.
Slate is a sedimentary rock that can be split horizontally to produce smooth flat surfaces that is often used as a roofing material.
slate, it is also used in roofing