These were most likely 6x12 or 8x16 tiles. The height should be half the size of the length for this particular 90 degree herringbone pattern. In other instances of herringbone, the height is much less than the length. It can also be laid in a diagonal / 45 degree herringbone pattern.

Jeff - where did you source the tile from? We are looking for belgium bluestone for our mud room. Thanks and hope all is well

Great choice! This tile was from Devon Tile on Lancaster Ave in Devon.