Slate Powder – Fine #20 Mesh Slate Flour Color: Gray Buckingham slate is quarried in Buckingham County, Virginia, in the town of Arvonia. This natural stone has a distinct gray/blue/black color and glistens due to its mica content. Slate is a metamorphic rock that is primarily made up of quartz, illite, and chlorite, which can account for up to 95% of its composition. Other minerals that are often present in slate include hematite, magnetite, pyrite, and biotite. Product Details Use as an ingredient in specialty mortars and plasters Blend with a binder such as Lime Putty, Natural Cement, NHL or White Portland Cement Use with a clear and UV stable epoxy 1 Quart = 3.25lb1 Gallon = 13lb2 Gallon = 26lb3.5 Gallon = 45lb Made in America! Technical Data Sheet Caution: stone sand may irritate eyes and skin. Wear a mask when working & do not breathe the dust. Keep out of reach from children.