Answer:

tessera

Answer	Crossword Clue
TESSERA	Mosaic tile
TESSERA	Mosaic piece
TESSERA	Mosiac tile

TESSERA	Mosaic tiles
TESSERA	Small square of glass or stone used for mosaics
TESSERA	Piece of stone or glass for mosaic work
TESSERA	Tile square
TESSERA	Mosaic unit
TESSERA	Mosaic part
TESSERA	Small mosaic tile
TESSERA	Mosaic piece.

TESSERA	Mosaic cube.
TESSERA	Small mosaic piece.
TESSERA	Bit of marble.
TESSERA	Piece used in mosaic.
TESSERA	Piece of mosaic.
TESSERA	Marble tile.
TESSERA	Small piece of tile
TESSERA	Mosaic square

TESSERA	Inlaid piece
TESSERA	Mosaic component
TESSERA	Bit of floorwork, maybe
TESSERA	Piece of art
TESSERA	Tile piece
TESSERA	Byzantine art bit
TESSERA	Mosaicist's tile
TESSERA	Tile in a mosaic

TESSERA	Bit of mosaic