Mica Tiles Two sizes 'small' and 'medium' Mica Tiles & Shapes are natural pieces of mica, which are heat resistant, acid free and lightfast. Each Mica Tile is distinctly different from the other, but all can be delaminated and relaminated making them perfect for preserving photos, pressed flowers and mementoes. Medium. Pack width is 13 cm.   Small. Pack width is 10 cm. back