Slate Stone

Slate stone is chemically a multi-mineral rock made of an aggregate of minerals and colloidal substances. Essentially mineral composition includes members of Mica group commonly sericite & muscovite, Clay group commonly paragonite, chlorite & kaonilite. The accessory minerals are oxides, calcites & minor amounts of quartz and feldspar along with subordinate amounts of ferro-magnesium minerals. Free silica is normally poor. It is resistant to acids and staining.