Knowledge Centre
How does slate get its colour?
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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