Straight from the Earth’s molten core and recently a toasty 2000 degrees Fahrenheit, the key ingredient for our chalk is literally lava. Specifically, it’s a basaltic magma that ends up as a rock called scoria. We take scoria, crush it, pulverize it, and convert it from volcanic slag to a powder. At that point, we use more traditional manufacturing methods, carefully calibrating our master blend to maximize the effects of the lava for billiard chalk. 2-Piece Chalk Pack Specially Formulated for Increased Friction Crafted from Basaltic Magma (Scoria).