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!
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.