Japan-law twinning is the best known of a multitude of twinning habits of quartz, and this one is good example of the flattened rabbit-ear type of twin.  The two terminations are both flattened blades, the larger being 1.5" high and 1.3" wide.  The terminations are wide chisel-tip types, and the crystals are flattened, only about a quarter inch thick.  They are fairly clear and have the characteristic perpendicular striations.  The tip of the larger crystal has damage, but it is not obvious.