Slate

Slate is a metamorphic rock derived from shale. Slate has a dull appearance and occurs in a number of colors including light and dark gray, green, purple and red.

Type

Rock

Description

Slate is a metamorphic rock derived from shale. Slate has a dull appearance and occurs in a number of colors including light and dark gray, green, purple and red.

Relation to Mining

Slate is often mined in open pit quarries.  Methods vary depending on variations in the physical properties of the deposit itself, such as density, fracturing/bedding planes and depth. The process is relatively simple: locate or create breaks in the stone, remove the stone using heavy machinery, secure the stone on a vehicle for transport, and move the material to storage and processing.

Uses

Slate’s foliation allows it to be broken into sheets of any desired thickness. Therefore, for centuries it has been used for roofing and for pavement stones around homes, buildings and gardens. The same feature made slate a most suitable material for making pool table tops and chalkboards, flooring material, gravestones and memorial tablets, and for electrical insulation.