A history of welsh slate and it’s origins
Slate is a metamorphic rock – that is to say it is a rock born of another rock. This birth began some 500 million years ago……..
Muds and silts deposited in the welsh basin (a large sea area including what is now llanberis ) were slowly buried by other sediments and volcanic ash. This process caused the muds and silts to change.
- The crushed muds and silts became hot and dry as all water was squeezed out of them, and gradually hardened into the rock known as slate.
- For much of it’s 500 million year history, the slate has remained buried beneath the surface of the land. However, during the last 2 million years the land surface has been excavated by the power of glaciers during successive ice ages, exposing the slate visible today.
- Slate is usually thought of as being black or grey, however different chemical reactions cause different minerals to occur in the rock producing colours such as blue, green and purple.
The minerals that make up slate are known as silicates and aluminium silicates or micas. It is the micas that produce the most characteristic feature of slate – that is, it’s ability to split into flat sheets along the grain of these micas (slaty cleavage). This feature makes slate ideal for roofing tiles and for a great many uses including art and craft.
By choosing welsh slate for your house name or number plaque:
- Slate will not rot & will last forever
- Welsh slate is the best quality in the world
- It is a natural product
- slate name plaque is very distinctive
- By having a slate name or number plaque on your house
- Whatever the type of property, terraced or detached your house becomes individual
- A slate plaque is distinctive
- It gives you a sense of pride
- The convenience of slate is that it is weatherproof & requires no maintenance
- By having a slate plaque it is keeping alive a part of welsh heritage.