There is some variation in crystal habit, which makes it a little difficult to see, but I think it’s easiest to recognize by looking at the arrangement of the sloping crystal faces.
These are crystals of ammonium sodium tartrate (the left is the L-form, and the right is the D-form).
The D- and L-form tartrate ions are mirror images of each other, and this relationship is preserved all the way through to the crystal structure.
In Japanese discount stores, you can find crystal-growing kits like this for just 330 yen (about 2 dollars). They keep the cost down by including only the chemicals and the instruction manual.
With this single kit, you can do five different experiments!