The ornamental design for a mosaictile, as shown and described.
FIG. 1 is a front perspective view of a mosaic tile showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a left side thereof;
FIG. 5 is a right side thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines showing the support structure connecting the individual pieces of material are for environmental purposes only and form no part of the claimed design.