By P.J. Heller Toothpaste. Kitty litter. Outdoor pizza ovens. Ceiling tiles. Garden and landscape growing material. Pipe insulation. Soaps. Environmental spill cleanup kits.  Those items and more have one ingredient in common that many people may not be aware of: perlite. “Perlite is all around us,” notes Michael Dunlavey in discussing a mineral found throughout the horticultural, construction and industrial …