Iridescent Glass Mosaic Tile by Morjo™ is sold by the 1/2 pound, which contains about 75+ tiles. Only the faces are iridized. The backs are plain colored glass that has been embossed with ridges for improved bonding. Note: the BLACK color is more GLOSS than Iridescent, but it looks good with the other colors. Click on a color to see the full product description.