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Slate is mainly composed of the minerals quartz and muscovite or illite. Slate can often be formed with several other minerals: biotite, chlorite, hematite, pyrite and less frequently: apatite, graphite, kaolinite, magnetite, tourmaline, zircon and feldspar. In purple slates of North Wales, ferrous reduction spheres form around iron nuclei and can leave a light green spotted texture.
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An ideal worktop choice for areas of high heat, however, long exposure to hot or cold temperatures may cause the slate to delaminate (divide into layers).
Slate is highly susceptible to Staining. Calcified hard water deposits may appear under pots or items that have prolonged contact with the slate surface. Sealing is strongly advised.
Being 5 to 6 on the Moh's scale of hardness, slate is highly scratch resistant. Marks do appear easily on some slate worktops. Most scratches can be buffed out with mineral oil or a stain pen.
Slate is naturally resistant to sunlight and UV rays and perfect for indoor and outdoor use in direct or natural light.
