Knowledge Centre

How does slate get its colour?

Date : 20 December, 2020

Slate comes in a range of types and colours which are naturally occurring and dependant on the location it was formed and the minerals it is consist of.

Green Slate

Due to chlorite, which is a group of common sheet silicate minerals, green slate often develops in certain areas where heat, pressure and chemical activity are abundant.

Blue Slate

As an aqueous sedimentary rock, blue slate tends to be crossed over grey to give a blue-grey tone. Its principal mineral composition is calcium carbonate.

Purple Slate

Purple slate is caused by haematite, which is an oxide of iron. Haematite is not visible to just the naked eye but can be easily recognised by its purple colour.

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