Our furniture projects and ideas Petrified wood occurs through a process of permineralization, in which the organic materials of the wood absorb naturally occurring minerals found in soil and sediment to solidify the wood to stone. Hand-selected, sanded, and polished into a sleek cuboid, this rectangular block of petrified wood, with its predominantly black coloration, makes a striking seat, side table, or pedestal for a favorite object. Durable enough for outdoor use. on Teak Outdoor Furniture